<?php
/**
 * Base-class for storage and retrieval of translated entities.
 * 
 * Please see the 'translatable' module for managing translations of database-content.
 * 
 * <b>Usage</b>
 * 
 * PHP:
 * <code>
 * _t('MyNamespace.MYENTITY', 'My default natural language value');
 * _t('MyNamespace.MYENTITY', 'My default natural language value', PR_MEDIUM, 'My explanatory context');
 * sprintf(_t('MyNamespace.MYENTITY', 'Counting %s things'), 42);
 * </code>
 * 
 * Templates:
 * <code>
 * <% _t('MyNamespace.MYENTITY', 'My default natural language value') %>
 * <% sprintf(_t('MyNamespace.MYENTITY','Counting %s things'),$ThingsCount) %>
 * </code>
 *
 * Javascript (see sapphire/javascript/i18n.js):
 * <code>
 * ss.i18n._t('MyEntity.MyNamespace','My default natural language value');
 * </code>
 * 
 * File-based i18n-translations always have a "locale" (e.g. 'en_US').
 * Common language names (e.g. 'en') are mainly used in the 'translatable' module
 * database-entities.
 * 
 * <b>Text Collection</b>
 * 
 * Features a "textcollector-mode" that parses all files with a certain extension
 * (currently *.php and *.ss) for new translatable strings. Textcollector will write
 * updated string-tables to their respective folders inside the module, and automatically
 * namespace entities to the classes/templates they are found in (e.g. $lang['en_US']['AssetAdmin']['UPLOADFILES']).
 * 
 * Caution: Does not apply any character-set conversion, it is assumed that all content
 * is stored and represented in UTF-8 (Unicode). Please make sure your files are created with the correct
 * character-set, and your HTML-templates render UTF-8.
 * 
 * Caution: The language file has to be stored in the same module path as the "filename namespaces"
 * on the entities. So an entity stored in $lang['en_US']['AssetAdmin']['DETAILSTAB'] has to
 * in the language file cms/lang/en_US.php, as the referenced file (AssetAdmin.php) is stored
 * in the "cms" module.
 * 
 * <b>Locales</b>
 *
 * For the i18n class, a "locale" consists of a language code plus a region code separated by an underscore, 
 * for example "de_AT" for German language ("de") in the region Austria ("AT").
 * See http://www.w3.org/International/articles/language-tags/ for a detailed description.
 * 
 * @see http://doc.silverstripe.org/i18n
 * @see http://www.w3.org/TR/i18n-html-tech-lang
 *
 * @author Bernat Foj Capell <bernat@silverstripe.com>
 * @package sapphire
 * @subpackage misc
 */
class i18n extends Object {
	
	/**
	 * This static variable is used to store the current defined locale.
	 */
	protected static $current_locale = '';
	
	/**
	 * @var string
	 */
	protected static $default_locale = 'en_US';
	
	/**
	 * @var boolean
	 */
	protected static $js_i18n = true;
	
	/**
	 * @var string
	 */
	protected static $date_format;
	
	/**
	 * @var string
	 */
	protected static $time_format;
	
	/**
	 * Use javascript i18n through the ss.i18n class (enabled by default).
	 * If set to TRUE, includes javascript requirements for the base library
	 * (sapphire/javascript/i18n.js) and all necessary lang files (e.g. sapphire/lang/de_DE.js)
	 * plus fallbacks to the default locale (e.g. sapphire/lang/en_US.js).
	 * If set to FALSE, only includes a stub implementation
	 * which is necessary. Mainly disabled to save bandwidth
	 * in a frontend context when website is in single language.
	 *
	 * Caution: This flag gets overwritten in {@link LeftAndMain::init()} to enforce javascript
	 * i18n for the CMS interfaces.
	 * 
	 * @see Requirements::process_i18n_javascript() 
	 *
	 * @param bool $bool
	 */
	public static function set_js_i18n($bool) {
		self::$js_i18n = $bool;
	}
	
	/**
	 * @return bool
	 */
	public static function get_js_i18n() {
		return self::$js_i18n;
	}
	
	/**
	 * @param string ISO date format
	 */
	public static function set_date_format($format) {
		self::$date_format = $format;
	}
	
	/**
	 * @return string ISO date format
	 */
	public static function get_date_format() {
		require_once 'Zend/Date.php';
		return (self::$date_format) ? self::$date_format : Zend_Locale_Format::getDateFormat(self::get_locale());
	}
	
	/**
	 * @param string ISO time format
	 */
	public static function set_time_format($format) {
		self::$time_format = $format;
	}
	
	/**
	 * @return string ISO time format
	 */
	public static function get_time_format() {
		require_once 'Zend/Date.php';
		return (self::$time_format) ? self::$time_format : Zend_Locale_Format::getTimeFormat(self::get_locale());
	}
	
	/**
	 * An exhaustive list of possible locales (code => language and country)
	 *
	 * @var array
	 */
	public static $all_locales = array (
			'aa_DJ' => 'Afar (Djibouti)',
			'ab_GE' => 'Abkhazian (Georgia)',
			'abr_GH' => 'Abron (Ghana)',
			'ace_ID' => 'Achinese (Indonesia)',
			'ady_RU' => 'Adyghe (Russia)',
			'af_ZA' => 'Afrikaans (South Africa)',
			'ak_GH' => 'Akan (Ghana)',
			'am_ET' => 'Amharic (Ethiopia)',
			'ar_AE' => 'Arabic (United Arab Emirates)',
			'ar_BH' => 'Arabic (Bahrain)',
			'ar_DZ' => 'Arabic (Algeria)',
			'ar_EG' => 'Arabic (Egypt)',
			'ar_EH' => 'Arabic (Western Sahara)',
			'ar_IQ' => 'Arabic (Iraq)',
			'ar_JO' => 'Arabic (Jordan)',
			'ar_KW' => 'Arabic (Kuwait)',
			'ar_LB' => 'Arabic (Lebanon)',
			'ar_LY' => 'Arabic (Libya)',
			'ar_MA' => 'Arabic (Morocco)',
			'ar_MR' => 'Arabic (Mauritania)',
			'ar_OM' => 'Arabic (Oman)',
			'ar_PS' => 'Arabic (Palestinian Territory)',
			'ar_QA' => 'Arabic (Qatar)',
			'ar_SA' => 'Arabic (Saudi Arabia)',
			'ar_SD' => 'Arabic (Sudan)',
			'ar_SY' => 'Arabic (Syria)',
			'ar_TD' => 'Arabic (Chad)',
			'ar_TN' => 'Arabic (Tunisia)',
			'ar_YE' => 'Arabic (Yemen)',
			'as_IN' => 'Assamese (India)',
			'auv_FR' => 'Auvergnat (France)',
			'av_RU' => 'Avaric (Russia)',
			'awa_IN' => 'Awadhi (India)',
			'ay_BO' => 'Aymara (Bolivia)',
			'ay_PE' => 'Aymara (Peru)',
			'az_AZ' => 'Azerbaijani (Azerbaijan)',
			'az_IR' => 'Azerbaijani (Iran)',
			'ba_RU' => 'Bashkir (Russia)',
			'ban_ID' => 'Balinese (Indonesia)',
			'bcc_PK' => 'Balochi, Southern (Pakistan)',
			'bcl_PH' => 'Bicolano, Central (Philippines)',
			'be_BY' => 'Belarusian (Belarus)',
			'bew_ID' => 'Betawi (Indonesia)',
			'bg_BG' => 'Bulgarian (Bulgaria)',
			'bgc_IN' => 'Haryanvi (India)',
			'bgn_PK' => 'Balochi, Western (Pakistan)',
			'bgp_PK' => 'Balochi, Easter (Pakistan)',
			'bhb_IN' => 'Bhili (India)',
			'bhi_IN' => 'Bhilali (India)',
			'bhk_PH' => 'Bicolano, Albay (Philippines)',
			'bho_IN' => 'Bhojpuri (India)',
			'bho_MU' => 'Bhojpuri (Mauritius)',
			'bho_NP' => 'Bhojpuri (Nepal)',
			'bi_VU' => 'Bislama (Vanuatu)',
			'bjj_IN' => 'Kanauji (India)',
			'bjn_ID' => 'Banjar (Indonesia)',
			'bm_ML' => 'Bambara (Mali)',
			'bn_BD' => 'Bengali (Bangladesh)',
			'bn_IN' => 'Bengali (India)',
			'bo_CN' => 'Tibetan (China)',
			'bqi_IR' => 'Bakhtiari (Iran)',
			'brh_PK' => 'Brahui (Pakistan)',
			'bs_BA' => 'Bosnian (Bosnia and Herzegovina)',
			'btk_ID' => 'Batak (Indonesia)',
			'buc_YT' => 'Bushi (Mayotte)',
			'bug_ID' => 'Buginese (Indonesia)',
			'ca_AD' => 'Catalan (Andorra)',
			'ca_ES' => 'Catalan (Spain)',
			'ce_RU' => 'Chechen (Russia)',
			'ceb_PH' => 'Cebuano (Philippines)',
			'cgg_UG' => 'Chiga (Uganda)',
			'ch_GU' => 'Chamorro (Guam)',
			'chk_FM' => 'Chuukese (Micronesia)',
			'crk_CA' => 'Cree, Plains (Canada)',
			'cs_CZ' => 'Czech (Czech Republic)',
			'cwd_CA' => 'Cree, Woods (Canada)',
			'cy_GB' => 'Welsh (United Kingdom)',
			'da_DK' => 'Danish (Denmark)',
			'da_GL' => 'Danish (Greenland)',
			'dcc_IN' => 'Deccan (India)',
			'de_AT' => 'German (Austria)',
			'de_BE' => 'German (Belgium)',
			'de_CH' => 'German (Switzerland)',
			'de_DE' => 'German (Germany)',
			'de_LI' => 'German (Liechtenstein)',
			'de_LU' => 'German (Luxembourg)',
			'dgo_IN' => 'Dogri (India)',
			'dhd_IN' => 'Dhundari (India)',
			'diq_TR' => 'Dimli (Turkey)',
			'dje_NE' => 'Zarma (Niger)',
			'dv_MV' => 'Divehi (Maldives)',
			'dz_BT' => 'Dzongkha (Bhutan)',
			'ee_GH' => 'Ewe (Ghana)',
			'el_CY' => 'Greek (Cyprus)',
			'el_GR' => 'Greek (Greece)',
			'en_AS' => 'English (American Samoa)',
			'en_AU' => 'English (Australia)',
			'en_BM' => 'English (Bermuda)',
			'en_BS' => 'English (Bahamas)',
			'en_CA' => 'English (Canada)',
			'en_DE' => 'English (Germany)',
			'en_ES' => 'English (Spain)',
			'en_FR' => 'English (France)',
			'en_GB' => 'English (United Kingdom)',
			'en_HK' => 'English (Hong Kong SAR China)',
			'en_IE' => 'English (Ireland)',
			'en_IN' => 'English (India)',
			'en_IT' => 'English (Italy)',
			'en_JM' => 'English (Jamaica)',
			'en_KE' => 'English (Kenya)',
			'en_LR' => 'English (Liberia)',
			'en_MM' => 'English (Myanmar)',
			'en_MW' => 'English (Malawi)',
			'en_MY' => 'English (Malaysia)',
			'en_NL' => 'English (Netherlands)',
			'en_NZ' => 'English (New Zealand)',
			'en_PH' => 'English (Philippines)',
			'en_SG' => 'English (Singapore)',
			'en_TT' => 'English (Trinidad and Tobago)',
			'en_US' => 'English (United States)',
			'en_ZA' => 'English (South Africa)',
			'eo_XX' => 'Esperanto',
			'es_419' => 'Spanish (Latin America)',
			'es_AR' => 'Spanish (Argentina)',
			'es_BO' => 'Spanish (Bolivia)',
			'es_CL' => 'Spanish (Chile)',
			'es_CO' => 'Spanish (Colombia)',
			'es_CR' => 'Spanish (Costa Rica)',
			'es_CU' => 'Spanish (Cuba)',
			'es_DO' => 'Spanish (Dominican Republic)',
			'es_EC' => 'Spanish (Ecuador)',
			'es_ES' => 'Spanish (Spain)',
			'es_GQ' => 'Spanish (Equatorial Guinea)',
			'es_GT' => 'Spanish (Guatemala)',
			'es_HN' => 'Spanish (Honduras)',
			'es_MX' => 'Spanish (Mexico)',
			'es_NI' => 'Spanish (Nicaragua)',
			'es_PA' => 'Spanish (Panama)',
			'es_PE' => 'Spanish (Peru)',
			'es_PH' => 'Spanish (Philippines)',
			'es_PR' => 'Spanish (Puerto Rico)',
			'es_PY' => 'Spanish (Paraguay)',
			'es_SV' => 'Spanish (El Salvador)',
			'es_US' => 'Spanish (United States)',
			'es_UY' => 'Spanish (Uruguay)',
			'es_VE' => 'Spanish (Venezuela)',
			'et_EE' => 'Estonian (Estonia)',
			'eu_ES' => 'Basque (Spain)',
			'fa_AF' => 'Persian (Afghanistan)',
			'fa_IR' => 'Persian (Iran)',
			'fa_PK' => 'Persian (Pakistan)',
			'fan_GQ' => 'Fang (Equatorial Guinea)',
			'fi_FI' => 'Finnish (Finland)',
			'fi_SE' => 'Finnish (Sweden)',
			'fil_PH' => 'Filipino (Philippines)',
			'fj_FJ' => 'Fijian (Fiji)',
			'fo_FO' => 'Faroese (Faroe Islands)',
			'fon_BJ' => 'Fon (Benin)',
			'fr_002' => 'French (Africa)',
			'fr_BE' => 'French (Belgium)',
			'fr_CA' => 'French (Canada)',
			'fr_CH' => 'French (Switzerland)',
			'fr_DZ' => 'French (Algeria)',
			'fr_FR' => 'French (France)',
			'fr_GF' => 'French (French Guiana)',
			'fr_GP' => 'French (Guadeloupe)',
			'fr_HT' => 'French (Haiti)',
			'fr_KM' => 'French (Comoros)',
			'fr_MA' => 'French (Morocco)',
			'fr_MQ' => 'French (Martinique)',
			'fr_MU' => 'French (Mauritius)',
			'fr_NC' => 'French (New Caledonia)',
			'fr_PF' => 'French (French Polynesia)',
			'fr_PM' => 'French (Saint Pierre and Miquelon)',
			'fr_RE' => 'French (Reunion)',
			'fr_SC' => 'French (Seychelles)',
			'fr_SN' => 'French (Senegal)',
			'fr_US' => 'French (United States)',
			'fuv_NG' => 'Fulfulde (Nigeria)',
			'ga_GB' => 'Irish (United Kingdom)',
			'ga_IE' => 'Irish (Ireland)',
			'gaa_GH' => 'Ga (Ghana)',
			'gbm_IN' => 'Garhwali (India)',
			'gcr_GF' => 'Guianese Creole French (French Guiana)',
			'gd_GB' => 'Scottish Gaelic (United Kingdom)',
			'gil_KI' => 'Gilbertese (Kiribati)',
			'gl_ES' => 'Galician (Spain)',
			'glk_IR' => 'Gilaki (Iran)',
			'gn_PY' => 'Guarani (Paraguay)',
			'gno_IN' => 'Gondi, Northern (India)',
			'gsw_CH' => 'Swiss German (Switzerland)',
			'gsw_LI' => 'Swiss German (Liechtenstein)',
			'gu_IN' => 'Gujarati (India)',
			'guz_KE' => 'Gusii (Kenya)',
			'ha_NE' => 'Hausa (Niger)',
			'ha_NG' => 'Hausa (Nigeria)',
			'haw_US' => 'Hawaiian (United States)',
			'haz_AF' => 'Hazaragi (Afghanistan)',
			'he_IL' => 'Hebrew (Israel)',
			'hi_IN' => 'Hindi (India)',
			'hil_PH' => 'Hiligaynon (Philippines)',
			'hne_IN' => 'Chhattisgarhi (India)',
			'hno_PK' => 'Hindko, Northern (Pakistan)',
			'hoc_IN' => 'Ho (India)',
			'hr_AT' => 'Croatian (Austria)',
			'hr_BA' => 'Croatian (Bosnia and Herzegovina)',
			'hr_HR' => 'Croatian (Croatia)',
			'ht_HT' => 'Haitian (Haiti)',
			'hu_AT' => 'Hungarian (Austria)',
			'hu_HU' => 'Hungarian (Hungary)',
			'hu_RO' => 'Hungarian (Romania)',
			'hu_RS' => 'Hungarian (Serbia)',
			'hy_AM' => 'Armenian (Armenia)',
			'id_ID' => 'Indonesian (Indonesia)',
			'ig_NG' => 'Igbo (Nigeria)',
			'ilo_PH' => 'Iloko (Philippines)',
			'inh_RU' => 'Ingush (Russia)',
			'is_IS' => 'Icelandic (Iceland)',
			'it_CH' => 'Italian (Switzerland)',
			'it_FR' => 'Italian (France)',
			'it_HR' => 'Italian (Croatia)',
			'it_IT' => 'Italian (Italy)',
			'it_SM' => 'Italian (San Marino)',
			'it_US' => 'Italian (United States)',
			'iu_CA' => 'Inuktitut (Canada)',
			'ja_JP' => 'Japanese (Japan)',
			'jv_ID' => 'Javanese (Indonesia)',
			'ka_GE' => 'Georgian (Georgia)',
			'kam_KE' => 'Kamba (Kenya)',
			'kbd_RU' => 'Kabardian (Russia)',
			'kfy_IN' => 'Kumauni (India)',
			'kha_IN' => 'Khasi (India)',
			'khn_IN' => 'Khandesi (India)',
			'ki_KE' => 'Kikuyu (Kenya)',
			'kj_NA' => 'Kuanyama (Namibia)',
			'kk_CN' => 'Kazakh (China)',
			'kk_KZ' => 'Kazakh (Kazakhstan)',
			'kl_DK' => 'Kalaallisut (Denmark)',
			'kl_GL' => 'Kalaallisut (Greenland)',
			'kln_KE' => 'Kalenjin (Kenya)',
			'km_KH' => 'Khmer (Cambodia)',
			'kn_IN' => 'Kannada (India)',
			'ko_KR' => 'Korean (Korea)',
			'koi_RU' => 'Komi-Permyak (Russia)',
			'kok_IN' => 'Konkani (India)',
			'kos_FM' => 'Kosraean (Micronesia)',
			'kpv_RU' => 'Komi-Zyrian (Russia)',
			'krc_RU' => 'Karachay-Balkar (Russia)',
			'kru_IN' => 'Kurukh (India)',
			'ks_IN' => 'Kashmiri (India)',
			'ku_IQ' => 'Kurdish (Iraq)',
			'ku_IR' => 'Kurdish (Iran)',
			'ku_SY' => 'Kurdish (Syria)',
			'ku_TR' => 'Kurdish (Turkey)',
			'kum_RU' => 'Kumyk (Russia)',
			'kxm_TH' => 'Khmer, Northern (Thailand)',
			'ky_KG' => 'Kirghiz (Kyrgyzstan)',
			'la_VA' => 'Latin (Vatican)',
			'lah_PK' => 'Lahnda (Pakistan)',
			'lb_LU' => 'Luxembourgish (Luxembourg)',
			'lbe_RU' => 'Lak (Russia)',
			'lc_XX' => 'LOLCAT',
			'lez_RU' => 'Lezghian (Russia)',
			'lg_UG' => 'Ganda (Uganda)',
			'lij_IT' => 'Ligurian (Italy)',
			'lij_MC' => 'Ligurian (Monaco)',
			'ljp_ID' => 'Lampung (Indonesia)',
			'lmn_IN' => 'Lambadi (India)',
			'ln_CD' => 'Lingala (Congo - Kinshasa)',
			'ln_CG' => 'Lingala (Congo - Brazzaville)',
			'lo_LA' => 'Lao (Laos)',
			'lrc_IR' => 'Luri, Northern (Iran)',
			'lt_LT' => 'Lithuanian (Lithuania)',
			'luo_KE' => 'Luo (Kenya)',
			'luy_KE' => 'Luyia (Kenya)',
			'lv_LV' => 'Latvian (Latvia)',
			'mad_ID' => 'Madurese (Indonesia)',
			'mai_IN' => 'Maithili (India)',
			'mai_NP' => 'Maithili (Nepal)',
			'mak_ID' => 'Makasar (Indonesia)',
			'mdf_RU' => 'Moksha (Russia)',
			'mdh_PH' => 'Maguindanao (Philippines)',
			'mer_KE' => 'Meru (Kenya)',
			'mfa_TH' => 'Malay, Pattani (Thailand)',
			'mfe_MU' => 'Morisyen (Mauritius)',
			'mg_MG' => 'Malagasy (Madagascar)',
			'mh_MH' => 'Marshallese (Marshall Islands)',
			'mi_NZ' => 'Maori (New Zealand)',
			'min_ID' => 'Minangkabau (Indonesia)',
			'mk_MK' => 'Macedonian (Macedonia)',
			'ml_IN' => 'Malayalam (India)',
			'mn_CN' => 'Mongolian (China)',
			'mn_MN' => 'Mongolian (Mongolia)',
			'mni_IN' => 'Manipuri (India)',
			'mr_IN' => 'Marathi (India)',
			'ms_BN' => 'Malay (Brunei)',
			'ms_CC' => 'Malay (Cocos Islands)',
			'ms_ID' => 'Malay (Indonesia)',
			'ms_MY' => 'Malay (Malaysia)',
			'ms_SG' => 'Malay (Singapore)',
			'mt_MT' => 'Maltese (Malta)',
			'mtr_IN' => 'Mewari (India)',
			'mup_IN' => 'Malvi (India)',
			'muw_IN' => 'Mundari (India)',
			'my_MM' => 'Burmese (Myanmar)',
			'myv_RU' => 'Erzya (Russia)',
			'na_NR' => 'Nauru (Nauru)',
			'nb_NO' => 'Norwegian Bokmal (Norway)',
			'nb_SJ' => 'Norwegian Bokmal (Svalbard and Jan Mayen)',
			'nd_ZW' => 'North Ndebele (Zimbabwe)',
			'ndc_MZ' => 'Ndau (Mozambique)',
			'ne_IN' => 'Nepali (India)',
			'ne_NP' => 'Nepali (Nepal)',
			'ng_NA' => 'Ndonga (Namibia)',
			'ngl_MZ' => 'Lomwe (Mozambique)',
			'niu_NU' => 'Niuean (Niue)',
			'nl_AN' => 'Dutch (Netherlands Antilles)',
			'nl_AW' => 'Dutch (Aruba)',
			'nl_BE' => 'Dutch (Belgium)',
			'nl_NL' => 'Dutch (Netherlands)',
			'nl_SR' => 'Dutch (Suriname)',
			'nn_NO' => 'Norwegian Nynorsk (Norway)',
			'nb_NO' => 'Norwegian',
			'nod_TH' => 'Thai, Northern (Thailand)',
			'noe_IN' => 'Nimadi (India)',
			'nso_ZA' => 'Northern Sotho (South Africa)',
			'ny_MW' => 'Nyanja (Malawi)',
			'ny_ZM' => 'Nyanja (Zambia)',
			'nyn_UG' => 'Nyankole (Uganda)',
			'om_ET' => 'Oromo (Ethiopia)',
			'or_IN' => 'Oriya (India)',
			'pa_IN' => 'Punjabi (India)',
			'pag_PH' => 'Pangasinan (Philippines)',
			'pap_AN' => 'Papiamento (Netherlands Antilles)',
			'pap_AW' => 'Papiamento (Aruba)',
			'pau_PW' => 'Palauan (Palau)',
			'pl_PL' => 'Polish (Poland)',
			'pl_UA' => 'Polish (Ukraine)',
			'pon_FM' => 'Pohnpeian (Micronesia)',
			'ps_AF' => 'Pashto (Afghanistan)',
			'ps_PK' => 'Pashto (Pakistan)',
			'pt_AO' => 'Portuguese (Angola)',
			'pt_BR' => 'Portuguese (Brazil)',
			'pt_CV' => 'Portuguese (Cape Verde)',
			'pt_GW' => 'Portuguese (Guinea-Bissau)',
			'pt_MZ' => 'Portuguese (Mozambique)',
			'pt_PT' => 'Portuguese (Portugal)',
			'pt_ST' => 'Portuguese (Sao Tome and Principe)',
			'pt_TL' => 'Portuguese (East Timor)',
			'qu_BO' => 'Quechua (Bolivia)',
			'qu_PE' => 'Quechua (Peru)',
			'rcf_RE' => 'R�union Creole French (Reunion)',
			'rej_ID' => 'Rejang (Indonesia)',
			'rif_MA' => 'Tarifit (Morocco)',
			'rjb_IN' => 'Rajbanshi (India)',
			'rm_CH' => 'Rhaeto-Romance (Switzerland)',
			'rmt_IR' => 'Domari (Iran)',
			'rn_BI' => 'Rundi (Burundi)',
			'ro_MD' => 'Romanian (Moldova)',
			'ro_RO' => 'Romanian (Romania)',
			'ro_RS' => 'Romanian (Serbia)',
			'ru_BY' => 'Russian (Belarus)',
			'ru_KG' => 'Russian (Kyrgyzstan)',
			'ru_KZ' => 'Russian (Kazakhstan)',
			'ru_RU' => 'Russian (Russia)',
			'ru_SJ' => 'Russian (Svalbard and Jan Mayen)',
			'ru_UA' => 'Russian (Ukraine)',
			'rw_RW' => 'Kinyarwanda (Rwanda)',
			'sa_IN' => 'Sanskrit (India)',
			'sah_RU' => 'Yakut (Russia)',
			'sas_ID' => 'Sasak (Indonesia)',
			'sat_IN' => 'Santali (India)',
			'sck_IN' => 'Sadri (India)',
			'sco_GB' => 'Scots (United Kingdom)',
			'sco_SCO' => 'Scots',
			'sd_IN' => 'Sindhi (India)',
			'sd_PK' => 'Sindhi (Pakistan)',
			'se_NO' => 'Northern Sami (Norway)',
			'sg_CF' => 'Sango (Central African Republic)',
			'si_LK' => 'Sinhalese (Sri Lanka)',
			'sid_ET' => 'Sidamo (Ethiopia)',
			'sk_RS' => 'Slovak (Serbia)',
			'sk_SK' => 'Slovak (Slovakia)',
			'sl_AT' => 'Slovenian (Austria)',
			'sl_SI' => 'Slovenian (Slovenia)',
			'sm_AS' => 'Samoan (American Samoa)',
			'sm_WS' => 'Samoan (Samoa)',
			'sn_ZW' => 'Shona (Zimbabwe)',
			'so_DJ' => 'Somali (Djibouti)',
			'so_ET' => 'Somali (Ethiopia)',
			'so_SO' => 'Somali (Somalia)',
			'sou_TH' => 'Thai, Southern (Thailand)',
			'sq_AL' => 'Albanian (Albania)',
			'sr_BA' => 'Serbian (Bosnia and Herzegovina)',
			'sr_ME' => 'Serbian (Montenegro)',
			'sr_RS' => 'Serbian (Serbia)',
			'ss_SZ' => 'Swati (Swaziland)',
			'ss_ZA' => 'Swati (South Africa)',
			'st_LS' => 'Southern Sotho (Lesotho)',
			'st_ZA' => 'Southern Sotho (South Africa)',
			'su_ID' => 'Sundanese (Indonesia)',
			'sv_AX' => 'Swedish (Aland Islands)',
			'sv_FI' => 'Swedish (Finland)',
			'sv_SE' => 'Swedish (Sweden)',
			'sw_KE' => 'Swahili (Kenya)',
			'sw_SO' => 'Swahili (Somalia)',
			'sw_TZ' => 'Swahili (Tanzania)',
			'sw_UG' => 'Swahili (Uganda)',
			'swb_KM' => 'Comorian (Comoros)',
			'swb_YT' => 'Comorian (Mayotte)',
			'swv_IN' => 'Shekhawati (India)',
			'ta_IN' => 'Tamil (India)',
			'ta_LK' => 'Tamil (Sri Lanka)',
			'ta_MY' => 'Tamil (Malaysia)',
			'ta_SG' => 'Tamil (Singapore)',
			'tcy_IN' => 'Tulu (India)',
			'te_IN' => 'Telugu (India)',
			'tet_TL' => 'Tetum (East Timor)',
			'tg_TJ' => 'Tajik (Tajikistan)',
			'th_TH' => 'Thai (Thailand)',
			'ti_ER' => 'Tigrinya (Eritrea)',
			'ti_ET' => 'Tigrinya (Ethiopia)',
			'tk_IR' => 'Turkmen (Iran)',
			'tk_TM' => 'Turkmen (Turkmenistan)',
			'tkl_TK' => 'Tokelau (Tokelau)',
			'tl_PH' => 'Tagalog (Philippines)',
			'tl_US' => 'Tagalog (United States)',
			'tn_BW' => 'Tswana (Botswana)',
			'tn_ZA' => 'Tswana (South Africa)',
			'to_TO' => 'Tonga (Tonga)',
			'tr_CY' => 'Turkish (Cyprus)',
			'tr_DE' => 'Turkish (Germany)',
			'tr_MK' => 'Turkish (Macedonia)',
			'tr_TR' => 'Turkish (Turkey)',
			'ts_MZ' => 'Tsonga (Mozambique)',
			'ts_ZA' => 'Tsonga (South Africa)',
			'tsg_PH' => 'Tausug (Philippines)',
			'tt_RU' => 'Tatar (Russia)',
			'tts_TH' => 'Thai, Northeastern (Thailand)',
			'tvl_TV' => 'Tuvalu (Tuvalu)',
			'tw_GH' => 'Twi (Ghana)',
			'ty_PF' => 'Tahitian (French Polynesia)',
			'tyv_RU' => 'Tuvinian (Russia)',
			'tzm_MA' => 'Tamazight, Central Atlas (Morocco)',
			'udm_RU' => 'Udmurt (Russia)',
			'ug_CN' => 'Uighur (China)',
			'uk_UA' => 'Ukrainian (Ukraine)',
			'uli_FM' => 'Ulithian (Micronesia)',
			'ur_IN' => 'Urdu (India)',
			'ur_PK' => 'Urdu (Pakistan)',
			'uz_AF' => 'Uzbek (Afghanistan)',
			'uz_UZ' => 'Uzbek (Uzbekistan)',
			've_ZA' => 'Venda (South Africa)',
			'vi_US' => 'Vietnamese (United States)',
			'vi_VN' => 'Vietnamese (Vietnam)',
			'vmw_MZ' => 'Waddar (Mozambique)',
			'wal_ET' => 'Walamo (Ethiopia)',
			'war_PH' => 'Waray (Philippines)',
			'wbq_IN' => 'Waddar (India)',
			'wbr_IN' => 'Wagdi (India)',
			'wo_MR' => 'Wolof (Mauritania)',
			'wo_SN' => 'Wolof (Senegal)',
			'wtm_IN' => 'Mewati (India)',
			'xh_ZA' => 'Xhosa (South Africa)',
			'xnr_IN' => 'Kangri (India)',
			'xog_UG' => 'Soga (Uganda)',
			'yap_FM' => 'Yapese (Micronesia)',
			'yo_NG' => 'Yoruba (Nigeria)',
			'za_CN' => 'Zhuang (China)',
			'zh_CN' => 'Chinese (China)',
			'zh_HK' => 'Chinese (Hong Kong SAR China)',
			'zh_MO' => 'Chinese (Macao SAR China)',
			'zh_SG' => 'Chinese (Singapore)',
			'zh_TW' => 'Chinese (Taiwan)',
			'zh_US' => 'Chinese (United States)',
			'zh_cmn' => 'Chinese (Mandarin)',
			'zh_yue' => 'Chinese (Cantonese)',
			'zu_ZA' => 'Zulu (South Africa)'
	);
	
	/**
	 * @var array $common_languages A list of commonly used languages, in the form
	 * langcode => array( EnglishName, NativeName)
	 */
	public static $common_languages = array(
		'af' => array('Afrikaans', 'Afrikaans'),
		'sq' => array('Albanian', 'shqip'),
		'ar' => array('Arabic', '&#1575;&#1604;&#1593;&#1585;&#1576;&#1610;&#1577;'),
		'eu' => array('Basque', 'euskera'),
		'be' => array('Belarusian', '&#1041;&#1077;&#1083;&#1072;&#1088;&#1091;&#1089;&#1082;&#1072;&#1103; &#1084;&#1086;&#1074;&#1072;'),
		'bn' => array('Bengali', '&#2476;&#2494;&#2434;&#2482;&#2494;'),
		'bg' => array('Bulgarian', '&#1073;&#1098;&#1083;&#1075;&#1072;&#1088;&#1089;&#1082;&#1080;'),
		'ca' => array('Catalan', 'catal&agrave;'),
		'zh_yue' => array('Chinese (Cantonese)', '&#24291;&#26481;&#35441; [&#24191;&#19996;&#35805;]'),
		'zh_cmn' => array('Chinese (Mandarin)', '&#26222;&#36890;&#35441; [&#26222;&#36890;&#35805;]'),
		'hr' => array('Croatian', 'Hrvatski'),
		'cs' => array('Czech', '&#x010D;e&#353;tina'),
		'cy' => array('Welsh', 'Welsh/Cymraeg'),
		'da' => array('Danish', 'dansk'),
		'nl' => array('Dutch',  'Nederlands'),
		'en' => array('English', 'English'),
		'eo' => array('Esperanto', 'Esperanto'),
		'et' => array('Estonian', 'eesti keel'),
		'fo' => array('Faroese', 'F&oslash;royska'),
		'fi' => array('Finnish', 'suomi'),
		'fr' => array('French', 'fran&ccedil;ais'),
		'gd' => array('Gaelic', 'Gaeilge'),
		'gl' => array('Galician', 'Galego'),
		'de' => array('German', 'Deutsch'),
		'el' => array('Greek', '&#949;&#955;&#955;&#951;&#957;&#953;&#954;&#940;'),
		'gu' => array('Gujarati', '&#2711;&#2753;&#2716;&#2736;&#2750;&#2724;&#2752;'),
		'ha' => array('Hausa', '&#1581;&#1614;&#1608;&#1618;&#1587;&#1614;'),
		'he' => array('Hebrew', '&#1506;&#1489;&#1512;&#1497;&#1514;'),
		'hi' => array('Hindi', '&#2361;&#2367;&#2344;&#2381;&#2342;&#2368;'),
		'hu' => array('Hungarian', 'magyar'),
		'is' => array('Icelandic', '&Iacute;slenska'),
		'io' => array('Ido', 'Ido'),
		'id' => array('Indonesian', 'Bahasa Indonesia'),
		'ga' => array('Irish', 'Irish'),
		'it' => array('Italian', 'italiano'),
		'ja' => array('Japanese', '&#26085;&#26412;&#35486;'),
		'jv' => array('Javanese', 'basa Jawa'),
		'ko' => array('Korean', '&#54620;&#44397;&#50612; [&#38867;&#22283;&#35486;]'),
		'ku' => array('Kurdish', 'Kurd&iacute;'),
		'lv' => array('Latvian', 'latvie&#353;u'),
		'lt' => array('Lithuanian', 'lietuvi&#353;kai'),
		'lmo' => array('Lombard', 'Lombardo'),
		'mk' => array('Macedonian', '&#1084;&#1072;&#1082;&#1077;&#1076;&#1086;&#1085;&#1089;&#1082;&#1080;'),
		'mi' => array('Maori', 'Maori'),
		'ms' => array('Malay', 'Bahasa melayu'),
		'mt' => array('Maltese', 'Malti'),
		'mr' => array('Marathi', '&#2350;&#2352;&#2366;&#2336;&#2368;'),
		'ne' => array('Nepali', '&#2344;&#2375;&#2346;&#2366;&#2354;&#2368;'),
		'no' => array('Norwegian', 'Norsk'),
		'om' => array('Oromo', 'Afaan Oromo'),
		'fa' => array('Persian', '&#1601;&#1575;&#1585;&#1587;&#1609;'),
		'pl' => array('Polish', 'polski'),
		'pt-PT' => array('Portuguese (Portugal)', 'portugu&ecirc;s (Portugal)'),
		'pt-BR' => array('Portuguese (Brazil)', 'portugu&ecirc;s (Brazil)'),
		'pa' => array('Punjabi', '&#2602;&#2672;&#2588;&#2622;&#2604;&#2624;'),
		'qu' => array('Quechua', 'Quechua'),
		'rm' => array('Romansh', 'rumantsch'),
		'ro' => array('Romanian', 'rom&acirc;n'),
		'ru' => array('Russian', '&#1056;&#1091;&#1089;&#1089;&#1082;&#1080;&#1081;'),
		'sco' => array('Scots', 'Scoats leid, Lallans'),
		'sr' => array('Serbian', '&#1089;&#1088;&#1087;&#1089;&#1082;&#1080;'),
		'sk' => array('Slovak', 'sloven&#269;ina'),
		'sl' => array('Slovenian', 'sloven&#353;&#269;ina'),
		'es' => array('Spanish', 'espa&ntilde;ol'),
		'sv' => array('Swedish', 'Svenska'),
		'tl' => array('Tagalog', 'Tagalog'),
		'ta' => array('Tamil', '&#2980;&#2990;&#3007;&#2996;&#3021;'),
		'te' => array('Telugu', '&#3108;&#3142;&#3122;&#3137;&#3095;&#3137;'),
		'to' => array('Tonga', 'chiTonga'),
		'ts' => array('Tsonga', 'xiTshonga'),
		'tn' => array('Tswana', 'seTswana'),
		'tr' => array('Turkish', 'T&uuml;rk&ccedil;e'),
		'tk' => array('Turkmen', '&#1090;&#1199;&#1088;&#1082;m&#1077;&#1085;&#1095;&#1077;'),
		'tw' => array('Twi', 'twi'),
		'uk' => array('Ukrainian', '&#1059;&#1082;&#1088;&#1072;&#1111;&#1085;&#1089;&#1100;&#1082;&#1072;'),
		'ur' => array('Urdu', '&#1575;&#1585;&#1583;&#1608;'),
		'uz' => array('Uzbek', '&#1118;&#1079;&#1073;&#1077;&#1082;'),
		've' => array('Venda', 'tshiVen&#x1E13;a'),
		'vi' => array('Vietnamese', 'ti&#7871;ng vi&#7879;t'),
		'wa' => array('Walloon', 'walon'),
		'wo' => array('Wolof', 'Wollof'),
		'xh' => array('Xhosa', 'isiXhosa'),
		'yi' => array('Yiddish', '&#1522;&#1460;&#1491;&#1497;&#1513;'),
		'zu' => array('Zulu', 'isiZulu')
	);
	
	/**
	 * @var array $common_locales
	 * Sorted alphabtically by the common language name,
	 * not the locale key.
	 */
	public static $common_locales = array(
		'af_ZA' => array('Afrikaans', 'Afrikaans'),
		'sq_AL' => array('Albanian', 'shqip'),
		'ar_EG' => array('Arabic', '&#1575;&#1604;&#1593;&#1585;&#1576;&#1610;&#1577;'),
		'eu_ES' => array('Basque', 'euskera'),
		'be_BY' => array('Belarusian', '&#1041;&#1077;&#1083;&#1072;&#1088;&#1091;&#1089;&#1082;&#1072;&#1103; &#1084;&#1086;&#1074;&#1072;'),
		'bn_BD' => array('Bengali', '&#2476;&#2494;&#2434;&#2482;&#2494;'),
		'bg_BG' => array('Bulgarian', '&#1073;&#1098;&#1083;&#1075;&#1072;&#1088;&#1089;&#1082;&#1080;'),
		'ca_ES' => array('Catalan', 'catal&agrave;'),
		'zh_yue' => array('Chinese (Cantonese)', '&#24291;&#26481;&#35441; [&#24191;&#19996;&#35805;]'),
		'zh_cmn' => array('Chinese (Mandarin)', '&#26222;&#36890;&#35441; [&#26222;&#36890;&#35805;]'),
		'hr_HR' => array('Croatian', 'Hrvatski'),
		'cs_CZ' => array('Czech', '&#x010D;e&#353;tina'),
		'cy_GB' => array('Welsh', 'Welsh/Cymraeg'),
		'da_DK' => array('Danish', 'dansk'),
		'nl_NL' => array('Dutch', 'Nederlands'),
		'en_NZ' => array('English (NZ)', 'English (NZ)'),
		'en_US' => array('English (US)', 'English (US)'),
		'en_GB' => array('English (UK)', 'English (UK)'),
		'eo_XX' => array('Esperanto', 'Esperanto'),
		'et_EE' => array('Estonian', 'eesti keel'),
		'fo_FO' => array('Faroese', 'F&oslash;royska'),
		'fi_FI' => array('Finnish', 'suomi'),
		'fr_FR' => array('French', 'fran&ccedil;ais'),
		'gd_GB' => array('Gaelic', 'Gaeilge'),
		'gl_ES' => array('Galician', 'Galego'),
		'de_DE' => array('German', 'Deutsch'),
		'el_GR' => array('Greek', '&#949;&#955;&#955;&#951;&#957;&#953;&#954;&#940;'),
		'gu_IN' => array('Gujarati', '&#2711;&#2753;&#2716;&#2736;&#2750;&#2724;&#2752;'),
		'ha_NG' => array('Hausa', '&#1581;&#1614;&#1608;&#1618;&#1587;&#1614;'),
		'he_IL' => array('Hebrew', '&#1506;&#1489;&#1512;&#1497;&#1514;'),
		'hi_IN' => array('Hindi', '&#2361;&#2367;&#2344;&#2381;&#2342;&#2368;'),
		'hu_HU' => array('Hungarian', 'magyar'),
		'is_IS' => array('Icelandic', '&Iacute;slenska'),
		'id_ID' => array('Indonesian', 'Bahasa Indonesia'),
		'ga_IE' => array('Irish', 'Irish'),
		'it_IT' => array('Italian', 'italiano'),
		'ja_JP' => array('Japanese', '&#26085;&#26412;&#35486;'),
		'jv_ID' => array('Javanese', 'basa Jawa'),
		'ko_KR' => array('Korean', '&#54620;&#44397;&#50612; [&#38867;&#22283;&#35486;]'),
		'ku_IQ' => array('Kurdish', 'Kurd&iacute;'),
		'lv_LV' => array('Latvian', 'latvie&#353;u'),
		'lt_LT' => array('Lithuanian', 'lietuvi&#353;kai'),
		'mk_MK' => array('Macedonian', '&#1084;&#1072;&#1082;&#1077;&#1076;&#1086;&#1085;&#1089;&#1082;&#1080;'),
		'mi_NZ' => array('Maori', 'Maori'),
		'ms_MY' => array('Malay', 'Bahasa melayu'),
		'mt_MT' => array('Maltese', 'Malti'),
		'mr_IN' => array('Marathi', '&#2350;&#2352;&#2366;&#2336;&#2368;'),
		'ne_NP' => array('Nepali', '&#2344;&#2375;&#2346;&#2366;&#2354;&#2368;'),
		'nb_NO' => array('Norwegian', 'Norsk'),
		'om_ET' => array('Oromo', 'Afaan Oromo'),
		'fa_IR' => array('Persian', '&#1601;&#1575;&#1585;&#1587;&#1609;'),
		'pl_PL' => array('Polish', 'polski'),
		'pt_PT' => array('Portuguese (Portugal)', 'portugu&ecirc;s (Portugal)'),
		'pt_BR' => array('Portuguese (Brazil)', 'portugu&ecirc;s (Brazil)'),
		'pa_IN' => array('Punjabi', '&#2602;&#2672;&#2588;&#2622;&#2604;&#2624;'),
		'qu_PE' => array('Quechua', 'Quechua'),
		'rm_CH' => array('Romansh', 'rumantsch'),
		'ro_RO' => array('Romanian', 'rom&acirc;n'),
		'ru_RU' => array('Russian', '&#1056;&#1091;&#1089;&#1089;&#1082;&#1080;&#1081;'),
		'sco_SCO' => array('Scots', 'Scoats leid, Lallans'),
		'sr_RS' => array('Serbian', '&#1089;&#1088;&#1087;&#1089;&#1082;&#1080;'),
		'sk_SK' => array('Slovak', 'sloven&#269;ina'),
		'sl_SI' => array('Slovenian', 'sloven&#353;&#269;ina'),
		'es_ES' => array('Spanish', 'espa&ntilde;ol'),
		'sv_SE' => array('Swedish', 'Svenska'),
		'tl_PH' => array('Tagalog', 'Tagalog'),
		'ta_IN' => array('Tamil', '&#2980;&#2990;&#3007;&#2996;&#3021;'),
		'te_IN' => array('Telugu', '&#3108;&#3142;&#3122;&#3137;&#3095;&#3137;'),
		'to_TO' => array('Tonga', 'chiTonga'),
		'ts_ZA' => array('Tsonga', 'xiTshonga'),
		'tn_ZA' => array('Tswana', 'seTswana'),
		'tr_TR' => array('Turkish', 'T&uuml;rk&ccedil;e'),
		'tk_TM' => array('Turkmen', '&#1090;&#1199;&#1088;&#1082;m&#1077;&#1085;&#1095;&#1077;'),
		'tw_GH' => array('Twi', 'twi'),
		'uk_UA' => array('Ukrainian', '&#1059;&#1082;&#1088;&#1072;&#1111;&#1085;&#1089;&#1100;&#1082;&#1072;'),
		'ur_PK' => array('Urdu', '&#1575;&#1585;&#1583;&#1608;'),
		'uz_UZ' => array('Uzbek', '&#1118;&#1079;&#1073;&#1077;&#1082;'),
		've_ZA' => array('Venda', 'tshiVen&#x1E13;a'),
		'vi_VN' => array('Vietnamese', 'ti&#7871;ng vi&#7879;t'),
		'wo_SN' => array('Wolof', 'Wollof'),
		'xh_ZA' => array('Xhosa', 'isiXhosa'),
		'zu_ZA' => array('Zulu', 'isiZulu'),
	);
	
	static $tinymce_lang = array(
		'ca_AD' => 'ca',
		'ca_ES' => 'ca',
		'cs_CZ' => 'cs',
		'cy_GB' => 'cy',
		'da_DK' => 'da',
		'da_GL' => 'da',
		'de_AT' => 'de',
		'de_BE' => 'de',
		'de_CH' => 'de',
		'de_DE' => 'de',
		'de_LI' => 'de',
		'de_LU' => 'de',
		'de_BR' => 'de',
		'de_US' => 'de',
		'el_CY' => 'el',
		'el_GR' => 'el',
		'es_AR' => 'es',
		'es_BO' => 'es',
		'es_CL' => 'es',
		'es_CO' => 'es',
		'es_CR' => 'es',
		'es_CU' => 'es',
		'es_DO' => 'es',
		'es_EC' => 'es',
		'es_ES' => 'es',
		'es_GQ' => 'es',
		'es_GT' => 'es',
		'es_HN' => 'es',
		'es_MX' => 'es',
		'es_NI' => 'es',
		'es_PA' => 'es',
		'es_PE' => 'es',
		'es_PH' => 'es',
		'es_PR' => 'es',
		'es_PY' => 'es',
		'es_SV' => 'es',
		'es_UY' => 'es',
		'es_VE' => 'es',
		'es_AD' => 'es',
		'es_BZ' => 'es',
		'es_US' => 'es',
		'fa_AF' => 'fa',
		'fa_IR' => 'fa',
		'fa_PK' => 'fa',
		'fi_FI' => 'fi',
		'fi_SE' => 'fi',
		'fr_BE' => 'fr',
		'fr_BF' => 'fr',
		'fr_BI' => 'fr',
		'fr_BJ' => 'fr',
		'fr_CA' => 'fr_ca',
		'fr_CF' => 'fr',
		'fr_CG' => 'fr',
		'fr_CH' => 'fr',
		'fr_CI' => 'fr',
		'fr_CM' => 'fr',
		'fr_DJ' => 'fr',
		'fr_DZ' => 'fr',
		'fr_FR' => 'fr',
		'fr_GA' => 'fr',
		'fr_GF' => 'fr',
		'fr_GN' => 'fr',
		'fr_GP' => 'fr',
		'fr_HT' => 'fr',
		'fr_KM' => 'fr',
		'fr_LU' => 'fr',
		'fr_MA' => 'fr',
		'fr_MC' => 'fr',
		'fr_MG' => 'fr',
		'fr_ML' => 'fr',
		'fr_MQ' => 'fr',
		'fr_MU' => 'fr',
		'fr_NC' => 'fr',
		'fr_NE' => 'fr',
		'fr_PF' => 'fr',
		'fr_PM' => 'fr',
		'fr_RE' => 'fr',
		'fr_RW' => 'fr',
		'fr_SC' => 'fr',
		'fr_SN' => 'fr',
		'fr_SY' => 'fr',
		'fr_TD' => 'fr',
		'fr_TG' => 'fr',
		'fr_TN' => 'fr',
		'fr_VU' => 'fr',
		'fr_WF' => 'fr',
		'fr_YT' => 'fr',
		'fr_GB' => 'fr',
		'fr_US' => 'fr',
		'he_IL' => 'he',
		'hu_HU' => 'hu',
		'hu_AT' => 'hu',
		'hu_RO' => 'hu',
		'hu_RS' => 'hu',
		'is_IS' => 'is',
		'it_CH' => 'it',
		'it_IT' => 'it',
		'it_SM' => 'it',
		'it_FR' => 'it',
		'it_HR' => 'it',
		'it_US' => 'it',
		'it_VA' => 'it',
		'ja_JP' => 'ja',
		'ko_KP' => 'ko',
		'ko_KR' => 'ko',
		'ko_CN' => 'ko',
		'nb_NO' => 'nb',
		'nb_SJ' => 'nb',
		'nl_AN' => 'nl',
		'nl_AW' => 'nl',
		'nl_BE' => 'nl',
		'nl_NL' => 'nl',
		'nl_SR' => 'nl',
		'nn_NO' => 'nn',
		'pl_PL' => 'pl',
		'pl_UA' => 'pl',
		'pt_AO' => 'pt_br',
		'pt_BR' => 'pt_br',
		'pt_CV' => 'pt_br',
		'pt_GW' => 'pt_br',
		'pt_MZ' => 'pt_br',
		'pt_PT' => 'pt_br',
		'pt_ST' => 'pt_br',
		'pt_TL' => 'pt_br',
		'ro_MD' => 'ro',
		'ro_RO' => 'ro',
		'ro_RS' => 'ro',
		'ru_BY' => 'ru',
		'ru_KG' => 'ru',
		'ru_KZ' => 'ru',
		'ru_RU' => 'ru',
		'ru_SJ' => 'ru',
		'ru_UA' => 'ru',
		'si_LK' => 'si',
		'sk_SK' => 'sk',
		'sk_RS' => 'sk',
		'sq_AL' => 'sq',
		'sr_BA' => 'sr',
		'sr_ME' => 'sr',
		'sr_RS' => 'sr',
		'sv_FI' => 'sv',
		'sv_SE' => 'sv',
		'tr_CY' => 'tr',
		'tr_TR' => 'tr',
		'tr_DE' => 'tr',
		'tr_MK' => 'tr',
		'uk_UA' => 'uk',
		'vi_VN' => 'vi',
		'vi_US' => 'vi',
		'zh_CN' => 'zh_cn',
		'zh_HK' => 'zh_cn',
		'zh_MO' => 'zh_cn',
		'zh_SG' => 'zh_cn',
		'zh_TW' => 'zh_tw',
		'zh_ID' => 'zh_cn',
		'zh_MY' => 'zh_cn',
		'zh_TH' => 'zh_cn',
		'zh_US' => 'zn_cn',

	);
	
	/**
	 * @var array $likely_subtags Provides you "likely locales"
	 * for a given "short" language code. This is a guess,
	 * as we can't disambiguate from e.g. "en" to "en_US" - it
	 * could also mean "en_UK".
	 * @see http://www.unicode.org/cldr/data/charts/supplemental/likely_subtags.html
	 */
	static $likely_subtags = array(
		'aa' => 'aa_ET',
		'ab' => 'ab_GE',
		'ady' => 'ady_RU',
		'af' => 'af_ZA',
		'ak' => 'ak_GH',
		'am' => 'am_ET',
		'ar' => 'ar_EG',
		'as' => 'as_IN',
		'ast' => 'ast_ES',
		'av' => 'av_RU',
		'ay' => 'ay_BO',
		'az' => 'az_AZ',
		'az_Cyrl' => 'az_AZ',
		'az_Arab' => 'az_IR',
		'az_IR' => 'az_IR',
		'ba' => 'ba_RU',
		'be' => 'be_BY',
		'bg' => 'bg_BG',
		'bi' => 'bi_VU',
		'bn' => 'bn_BD',
		'bo' => 'bo_CN',
		'bs' => 'bs_BA',
		'ca' => 'ca_ES',
		'ce' => 'ce_RU',
		'ceb' => 'ceb_PH',
		'ch' => 'ch_GU',
		'chk' => 'chk_FM',
		'crk' => 'crk_CA',
		'cs' => 'cs_CZ',
		'cwd' => 'cwd_CA',
		'cy' => 'cy_GB',
		'da' => 'da_DK',
		'de' => 'de_DE',
		'dv' => 'dv_MV',
		'dz' => 'dz_BT',
		'ee' => 'ee_GH',
		'efi' => 'efi_NG',
		'el' => 'el_GR',
		'en' => 'en_US',
		'es' => 'es_ES',
		'et' => 'et_EE',
		'eu' => 'eu_ES',
		'fa' => 'fa_IR',
		'fi' => 'fi_FI',
		'fil' => 'fil_PH',
		'fj' => 'fj_FJ',
		'fo' => 'fo_FO',
		'fr' => 'fr_FR',
		'fur' => 'fur_IT',
		'fy' => 'fy_NL',
		'ga' => 'ga_IE',
		'gaa' => 'gaa_GH',
		'gd' => 'gd_GB',
		'gil' => 'gil_KI',
		'gl' => 'gl_ES',
		'gn' => 'gn_PY',
		'gu' => 'gu_IN',
		'ha' => 'ha_NG',
		'ha_Arab' => 'ha_SD',
		'ha_SD' => 'ha_SD',
		'haw' => 'haw_US',
		'he' => 'he_IL',
		'hi' => 'hi_IN',
		'hil' => 'hil_PH',
		'ho' => 'ho_PG',
		'hr' => 'hr_HR',
		'ht' => 'ht_HT',
		'hu' => 'hu_HU',
		'hy' => 'hy_AM',
		'id' => 'id_ID',
		'ig' => 'ig_NG',
		'ii' => 'ii_CN',
		'ilo' => 'ilo_PH',
		'inh' => 'inh_RU',
		'is' => 'is_IS',
		'it' => 'it_IT',
		'iu' => 'iu_CA',
		'ja' => 'ja_JP',
		'jv' => 'jv_ID',
		'ka' => 'ka_GE',
		'kaj' => 'kaj_NG',
		'kam' => 'kam_KE',
		'kbd' => 'kbd_RU',
		'kha' => 'kha_IN',
		'kk' => 'kk_KZ',
		'kl' => 'kl_GL',
		'km' => 'km_KH',
		'kn' => 'kn_IN',
		'ko' => 'ko_KR',
		'koi' => 'koi_RU',
		'kok' => 'kok_IN',
		'kos' => 'kos_FM',
		'kpe' => 'kpe_LR',
		'kpv' => 'kpv_RU',
		'krc' => 'krc_RU',
		'ks' => 'ks_IN',
		'ku' => 'ku_IQ',
		'ku_Latn' => 'ku_TR',
		'ku_TR' => 'ku_TR',
		'kum' => 'kum_RU',
		'ky' => 'ky_KG',
		'la' => 'la_VA',
		'lah' => 'lah_PK',
		'lb' => 'lb_LU',
		'lbe' => 'lbe_RU',
		'lez' => 'lez_RU',
		'ln' => 'ln_CD',
		'lo' => 'lo_LA',
		'lt' => 'lt_LT',
		'lv' => 'lv_LV',
		'mai' => 'mai_IN',
		'mdf' => 'mdf_RU',
		'mdh' => 'mdh_PH',
		'mg' => 'mg_MG',
		'mh' => 'mh_MH',
		'mi' => 'mi_NZ',
		'mk' => 'mk_MK',
		'ml' => 'ml_IN',
		'mn' => 'mn_MN',
		'mn_CN' => 'mn_CN',
		'mn_Mong' => 'mn_CN',
		'mr' => 'mr_IN',
		'ms' => 'ms_MY',
		'mt' => 'mt_MT',
		'my' => 'my_MM',
		'myv' => 'myv_RU',
		'na' => 'na_NR',
		'nb' => 'nb_NO',
		'ne' => 'ne_NP',
		'niu' => 'niu_NU',
		'nl' => 'nl_NL',
		'nn' => 'nn_NO',
		'nr' => 'nr_ZA',
		'nso' => 'nso_ZA',
		'ny' => 'ny_MW',
		'om' => 'om_ET',
		'or' => 'or_IN',
		'os' => 'os_GE',
		'pa' => 'pa_IN',
		'pa_Arab' => 'pa_PK',
		'pa_PK' => 'pa_PK',
		'pag' => 'pag_PH',
		'pap' => 'pap_AN',
		'pau' => 'pau_PW',
		'pl' => 'pl_PL',
		'pon' => 'pon_FM',
		'ps' => 'ps_AF',
		'pt' => 'pt_BR',
		'qu' => 'qu_PE',
		'rm' => 'rm_CH',
		'rn' => 'rn_BI',
		'ro' => 'ro_RO',
		'ru' => 'ru_RU',
		'rw' => 'rw_RW',
		'sa' => 'sa_IN',
		'sah' => 'sah_RU',
		'sat' => 'sat_IN',
		'sd' => 'sd_IN',
		'se' => 'se_NO',
		'sg' => 'sg_CF',
		'si' => 'si_LK',
		'sid' => 'sid_ET',
		'sk' => 'sk_SK',
		'sl' => 'sl_SI',
		'sm' => 'sm_WS',
		'sn' => 'sn_ZW',
		'so' => 'so_SO',
		'sq' => 'sq_AL',
		'sr' => 'sr_RS',
		'ss' => 'ss_ZA',
		'st' => 'st_ZA',
		'su' => 'su_ID',
		'sv' => 'sv_SE',
		'sw' => 'sw_TZ',
		'swb' => 'swb_KM',
		'ta' => 'ta_IN',
		'te' => 'te_IN',
		'tet' => 'tet_TL',
		'tg' => 'tg_TJ',
		'th' => 'th_TH',
		'ti' => 'ti_ET',
		'tig' => 'tig_ER',
		'tk' => 'tk_TM',
		'tkl' => 'tkl_TK',
		'tl' => 'tl_PH',
		'tn' => 'tn_ZA',
		'to' => 'to_TO',
		'tpi' => 'tpi_PG',
		'tr' => 'tr_TR',
		'trv' => 'trv_TW',
		'ts' => 'ts_ZA',
		'tsg' => 'tsg_PH',
		'tt' => 'tt_RU',
		'tts' => 'tts_TH',
		'tvl' => 'tvl_TV',
		'tw' => 'tw_GH',
		'ty' => 'ty_PF',
		'tyv' => 'tyv_RU',
		'udm' => 'udm_RU',
		'ug' => 'ug_CN',
		'uk' => 'uk_UA',
		'uli' => 'uli_FM',
		'und' => 'en_US',
		'und_AD' => 'ca_AD',
		'und_AE' => 'ar_AE',
		'und_AF' => 'fa_AF',
		'und_AL' => 'sq_AL',
		'und_AM' => 'hy_AM',
		'und_AN' => 'pap_AN',
		'und_AO' => 'pt_AO',
		'und_AR' => 'es_AR',
		'und_AS' => 'sm_AS',
		'und_AT' => 'de_AT',
		'und_AW' => 'nl_AW',
		'und_AX' => 'sv_AX',
		'und_AZ' => 'az_AZ',
		'und_Arab' => 'ar_EG',
		'und_Arab_CN' => 'ug_CN',
		'und_Arab_DJ' => 'ar_DJ',
		'und_Arab_ER' => 'ar_ER',
		'und_Arab_IL' => 'ar_IL',
		'und_Arab_IN' => 'ur_IN',
		'und_Arab_PK' => 'ur_PK',
		'und_Armn' => 'hy_AM',
		'und_BA' => 'bs_BA',
		'und_BD' => 'bn_BD',
		'und_BE' => 'nl_BE',
		'und_BF' => 'fr_BF',
		'und_BG' => 'bg_BG',
		'und_BH' => 'ar_BH',
		'und_BI' => 'rn_BI',
		'und_BJ' => 'fr_BJ',
		'und_BL' => 'fr_BL',
		'und_BN' => 'ms_BN',
		'und_BO' => 'es_BO',
		'und_BR' => 'pt_BR',
		'und_BT' => 'dz_BT',
		'und_BY' => 'be_BY',
		'und_Beng' => 'bn_BD',
		'und_CD' => 'fr_CD',
		'und_CF' => 'sg_CF',
		'und_CG' => 'ln_CG',
		'und_CH' => 'de_CH',
		'und_CI' => 'fr_CI',
		'und_CL' => 'es_CL',
		'und_CM' => 'fr_CM',
		'und_CN' => 'zh_CN',
		'und_CO' => 'es_CO',
		'und_CR' => 'es_CR',
		'und_CU' => 'es_CU',
		'und_CV' => 'pt_CV',
		'und_CY' => 'el_CY',
		'und_CZ' => 'cs_CZ',
		'und_Cans' => 'cwd_CA',
		'und_Cyrl' => 'ru_RU',
		'und_Cyrl_BA' => 'sr_BA',
		'und_Cyrl_GE' => 'ab_GE',
		'und_DE' => 'de_DE',
		'und_DJ' => 'aa_DJ',
		'und_DK' => 'da_DK',
		'und_DO' => 'es_DO',
		'und_DZ' => 'ar_DZ',
		'und_Deva' => 'hi_IN',
		'und_EC' => 'es_EC',
		'und_EE' => 'et_EE',
		'und_EG' => 'ar_EG',
		'und_EH' => 'ar_EH',
		'und_ER' => 'ti_ER',
		'und_ES' => 'es_ES',
		'und_ET' => 'am_ET',
		'und_Ethi' => 'am_ET',
		'und_FI' => 'fi_FI',
		'und_FJ' => 'fj_FJ',
		'und_FM' => 'chk_FM',
		'und_FO' => 'fo_FO',
		'und_FR' => 'fr_FR',
		'und_GA' => 'fr_GA',
		'und_GE' => 'ka_GE',
		'und_GF' => 'fr_GF',
		'und_GH' => 'ak_GH',
		'und_GL' => 'kl_GL',
		'und_GN' => 'fr_GN',
		'und_GP' => 'fr_GP',
		'und_GQ' => 'fr_GQ',
		'und_GR' => 'el_GR',
		'und_GT' => 'es_GT',
		'und_GU' => 'ch_GU',
		'und_GW' => 'pt_GW',
		'und_Geor' => 'ka_GE',
		'und_Grek' => 'el_GR',
		'und_Gujr' => 'gu_IN',
		'und_Guru' => 'pa_IN',
		'und_HK' => 'zh_HK',
		'und_HN' => 'es_HN',
		'und_HR' => 'hr_HR',
		'und_HT' => 'ht_HT',
		'und_HU' => 'hu_HU',
		'und_Hani' => 'zh_CN',
		'und_Hans' => 'zh_CN',
		'und_Hant' => 'zh_TW',
		'und_Hebr' => 'he_IL',
		'und_ID' => 'id_ID',
		'und_IL' => 'he_IL',
		'und_IN' => 'hi_IN',
		'und_IQ' => 'ar_IQ',
		'und_IR' => 'fa_IR',
		'und_IS' => 'is_IS',
		'und_IT' => 'it_IT',
		'und_JO' => 'ar_JO',
		'und_JP' => 'ja_JP',
		'und_Jpan' => 'ja_JP',
		'und_KG' => 'ky_KG',
		'und_KH' => 'km_KH',
		'und_KM' => 'ar_KM',
		'und_KP' => 'ko_KP',
		'und_KR' => 'ko_KR',
		'und_KW' => 'ar_KW',
		'und_KZ' => 'ru_KZ',
		'und_Khmr' => 'km_KH',
		'und_Knda' => 'kn_IN',
		'und_Kore' => 'ko_KR',
		'und_LA' => 'lo_LA',
		'und_LB' => 'ar_LB',
		'und_LI' => 'de_LI',
		'und_LK' => 'si_LK',
		'und_LS' => 'st_LS',
		'und_LT' => 'lt_LT',
		'und_LU' => 'fr_LU',
		'und_LV' => 'lv_LV',
		'und_LY' => 'ar_LY',
		'und_Laoo' => 'lo_LA',
		'und_Latn_CN' => 'ii_CN',
		'und_Latn_CY' => 'tr_CY',
		'und_Latn_DZ' => 'fr_DZ',
		'und_Latn_ET' => 'om_ET',
		'und_Latn_KM' => 'fr_KM',
		'und_Latn_MA' => 'fr_MA',
		'und_Latn_MK' => 'sq_MK',
		'und_Latn_SY' => 'fr_SY',
		'und_Latn_TD' => 'fr_TD',
		'und_Latn_TN' => 'fr_TN',
		'und_MA' => 'ar_MA',
		'und_MC' => 'fr_MC',
		'und_MD' => 'ro_MD',
		'und_ME' => 'sr_ME',
		'und_MF' => 'fr_MF',
		'und_MG' => 'mg_MG',
		'und_MH' => 'mh_MH',
		'und_MK' => 'mk_MK',
		'und_ML' => 'fr_ML',
		'und_MM' => 'my_MM',
		'und_MN' => 'mn_MN',
		'und_MO' => 'zh_MO',
		'und_MQ' => 'fr_MQ',
		'und_MR' => 'ar_MR',
		'und_MT' => 'mt_MT',
		'und_MV' => 'dv_MV',
		'und_MW' => 'ny_MW',
		'und_MX' => 'es_MX',
		'und_MY' => 'ms_MY',
		'und_MZ' => 'pt_MZ',
		'und_Mlym' => 'ml_IN',
		'und_Mong' => 'mn_CN',
		'und_Mymr' => 'my_MM',
		'und_NC' => 'fr_NC',
		'und_NE' => 'ha_NE',
		'und_NG' => 'ha_NG',
		'und_NI' => 'es_NI',
		'und_NL' => 'nl_NL',
		'und_NO' => 'nb_NO',
		'und_NP' => 'ne_NP',
		'und_NR' => 'na_NR',
		'und_NU' => 'niu_NU',
		'und_OM' => 'ar_OM',
		'und_Orya' => 'or_IN',
		'und_PA' => 'es_PA',
		'und_PE' => 'es_PE',
		'und_PF' => 'ty_PF',
		'und_PG' => 'tpi_PG',
		'und_PH' => 'fil_PH',
		'und_PK' => 'ur_PK',
		'und_PL' => 'pl_PL',
		'und_PM' => 'fr_PM',
		'und_PR' => 'es_PR',
		'und_PS' => 'ar_PS',
		'und_PT' => 'pt_PT',
		'und_PW' => 'pau_PW',
		'und_PY' => 'gn_PY',
		'und_QA' => 'ar_QA',
		'und_RE' => 'fr_RE',
		'und_RO' => 'ro_RO',
		'und_RS' => 'sr_RS',
		'und_RU' => 'ru_RU',
		'und_RW' => 'rw_RW',
		'und_SA' => 'ar_SA',
		'und_SD' => 'ar_SD',
		'und_SE' => 'sv_SE',
		'und_SI' => 'sl_SI',
		'und_SJ' => 'nb_SJ',
		'und_SK' => 'sk_SK',
		'und_SM' => 'it_SM',
		'und_SN' => 'fr_SN',
		'und_SO' => 'so_SO',
		'und_SR' => 'nl_SR',
		'und_ST' => 'pt_ST',
		'und_SV' => 'es_SV',
		'und_SY' => 'ar_SY',
		'und_Sinh' => 'si_LK',
		'und_TD' => 'ar_TD',
		'und_TG' => 'ee_TG',
		'und_TH' => 'th_TH',
		'und_TJ' => 'tg_TJ',
		'und_TK' => 'tkl_TK',
		'und_TL' => 'tet_TL',
		'und_TM' => 'tk_TM',
		'und_TN' => 'ar_TN',
		'und_TO' => 'to_TO',
		'und_TR' => 'tr_TR',
		'und_TV' => 'tvl_TV',
		'und_TW' => 'zh_TW',
		'und_Taml' => 'ta_IN',
		'und_Telu' => 'te_IN',
		'und_Thaa' => 'dv_MV',
		'und_Thai' => 'th_TH',
		'und_Tibt' => 'bo_CN',
		'und_UA' => 'uk_UA',
		'und_UY' => 'es_UY',
		'und_UZ' => 'uz_UZ',
		'und_VA' => 'la_VA',
		'und_VE' => 'es_VE',
		'und_VN' => 'vi_VN',
		'und_VU' => 'fr_VU',
		'und_WF' => 'fr_WF',
		'und_WS' => 'sm_WS',
		'und_YE' => 'ar_YE',
		'und_YT' => 'fr_YT',
		'und_ZW' => 'sn_ZW',
		'ur' => 'ur_PK',
		'uz' => 'uz_UZ',
		'uz_AF' => 'uz_AF',
		'uz_Arab' => 'uz_AF',
		've' => 've_ZA',
		'vi' => 'vi_VN',
		'wal' => 'wal_ET',
		'war' => 'war_PH',
		'wo' => 'wo_SN',
		'xh' => 'xh_ZA',
		'yap' => 'yap_FM',
		'yo' => 'yo_NG',
		'za' => 'za_CN',
		'zh' => 'zh_CN',
		'zh_HK' => 'zh_HK',
		'zh_Hani' => 'zh_CN',
		'zh_Hant' => 'zh_TW',
		'zh_MO' => 'zh_MO',
		'zh_TW' => 'zh_TW',
		'zu' => 'zu_ZA',
	);
	
	/**
	 * This is the main translator function. Returns the string defined by $class and $entity according to the currently set locale.
	 *
	 * @param string $entity Entity that identifies the string. It must be in the form "Namespace.Entity" where Namespace will be usually
	 * 						 the class name where this string is used and Entity identifies the string inside the namespace.
	 * @param string $string The original string itself. In a usual call this is a mandatory parameter, but if you are reusing a string which
	 *				 has already been "declared" (using another call to this function, with the same class and entity), you can omit it.
	 * @param string $priority Optional parameter to set a translation priority. If a string is widely used, should have a high priority (PR_HIGH),
	 * 				    in this way translators will be able to prioritise this strings. If a string is rarely shown, you should use PR_LOW.
	 *				    You can use PR_MEDIUM as well. Leaving this field blank will be interpretated as a "normal" priority (less than PR_MEDIUM).
	 * @param string $context If the string can be difficult to translate by any reason, you can help translators with some more info using this param
	 *
	 * @return string The translated string, according to the currently set locale {@link i18n::set_locale()}
	 */
	static function _t($entity, $string = "", $priority = 40, $context = "") {
		global $lang;
		
		// get current locale (either default or user preference)
		$locale = i18n::get_locale();

		// parse $entity into its parts
		$entityParts = explode('.',$entity);
		$realEntity = array_pop($entityParts);
		$class = implode('.',$entityParts);
		
		// if language table isn't loaded for this locale, get it for each of the modules
		if(!isset($lang[$locale])) i18n::include_by_locale($locale);

		// fallback to the passed $string if no translation is present
		$transEntity = isset($lang[$locale][$class][$realEntity]) ? $lang[$locale][$class][$realEntity] : $string;

		// entities can be stored in both array and literal values in the language tables
		return (is_array($transEntity) ? $transEntity[0] : $transEntity);
	}

	/**
	 * Get a list of commonly used languages
	 *
	 * @param boolean $native Use native names for languages instead of English ones
	 * @return list of languages in the form 'code' => 'name'
	 */
	static function get_common_languages($native = false) {
		$languages = array();
		foreach (self::$common_languages as $code => $name) {
			$languages[$code] = ($native ? $name[1] : $name[0]);
		}
		return $languages;
	}
	
	/**
	 * Get a list of commonly used locales
	 *
	 * @param boolean $native Use native names for locale instead of English ones
	 * @return list of languages in the form 'code' => 'name'
	 */
	static function get_common_locales($native = false) {
		$languages = array();
		foreach (self::$common_locales as $code => $name) {
			$languages[$code] = ($native ? $name[1] : $name[0]);
		}
		return $languages;
	}
	
	/**
	 * Get a list of locales (code => language and country)
	 *
	 * @return list of languages in the form 'code' => 'name'
	 */
	static function get_locale_list() {
		return self::$all_locales;
	}
	
	/**
	 * Searches the root-directory for module-directories
	 * (identified by having a _config.php on their first directory-level).
	 * Returns all found locales.
	 * 
	 * @return array
	 */
	static function get_existing_translations() {
		$locales = array();
		
		$baseDir = Director::baseFolder();
		$modules = scandir($baseDir);
		foreach($modules as $module) {
			if($module[0] == '.') continue;
			
			$moduleDir = $baseDir . DIRECTORY_SEPARATOR . $module;
			$langDir = $moduleDir . DIRECTORY_SEPARATOR . "lang";
			if(is_dir($moduleDir) && is_file($moduleDir . DIRECTORY_SEPARATOR . "_config.php") && is_dir($langDir)) {
				$moduleLocales = scandir($langDir);
				foreach($moduleLocales as $moduleLocale) {
					if(preg_match('/(.*)\.php$/',$moduleLocale, $matches)) {
						if(isset($matches[1]) && isset(self::$all_locales[$matches[1]])) {
							$locales[$matches[1]] = self::$all_locales[$matches[1]];
						}
					}
				} 
			}
		}

		// sort by title (not locale)
		asort($locales);
		
		return $locales;
	}
	
	/**
	 * Get a name from a language code (two characters, e.g. "en").
	 * 
	 * @see get_locale_name()
	 *
	 * @param mixed $code Language code
	 * @param boolean $native If true, the native name will be returned
	 * @return Name of the language
	 */
	static function get_language_name($code, $native = false) {
		$langs = self::$common_languages;
		if($native) {
			return (isset($langs[$code][1])) ? $langs[$code][1] : false;
		} else {
			return (isset($langs[$code][0])) ? $langs[$code][0] : false;
		}
	}
	
	/**
	 * Get a name from a locale code (xx_YY).
	 * 
	 * @see get_language_name()
	 *
	 * @param mixed $code locale code
	 * @return Name of the locale
	 */
	static function get_locale_name($code) {
		$langs = self::get_locale_list();
		return isset($langs[$code]) ? $langs[$code] : false;
	}
	
	/**
	 * Get a code from an English language name
	 *
	 * @param mixed $name Name of the language
	 * @return Language code (if the name is not found, it'll return the passed name)
	 */
	static function get_language_code($name) {
		$code = array_search($name,self::get_common_languages());
		return ($code ? $code : $name);
	}
	
	/**
	 * Get the current tinyMCE language
	 * 
	 * @return Language
	 */
	static function get_tinymce_lang() {
		if(isset(self::$tinymce_lang[self::get_locale()])) {
			return self::$tinymce_lang[self::get_locale()];
		}
		
		return 'en';
	}
	
	/**
	 * Searches the root-directory for module-directories
	 * (identified by having a _config.php on their first directory-level
	 * and a language-file with the default locale in the /lang-subdirectory).
	 * 
	 * @return array
	 */
	static function get_translatable_modules() {
		$translatableModules = array();
		
		$baseDir = Director::baseFolder();
		$modules = scandir($baseDir);
		foreach($modules as $module) {
			$moduleDir = $baseDir . DIRECTORY_SEPARATOR . $module;
			if(
				is_dir($moduleDir) 
				&& is_file($moduleDir . DIRECTORY_SEPARATOR . "_config.php")
				&& is_file($moduleDir . DIRECTORY_SEPARATOR . "lang" . DIRECTORY_SEPARATOR . self::$default_locale . ".php")
			) {
				$translatableModules[] = $module;
			}
		}
		return $translatableModules;
	}
	
	/**
	 * Returns the "short" language name from a locale,
	 * e.g. "en_US" would return "en". This conversion
	 * is determined internally by the {@link $tinymce_lang}
	 * lookup table. If no match can be found in this lookup,
	 * the characters before the underscore ("_") are returned.
	 * 
	 * @todo More generic lookup table, don't rely on tinymce specific conversion
	 * 
	 * @param string $locale E.g. "en_US"
	 * @return string Short language code, e.g. "en"
	 */
	static function get_lang_from_locale($locale) {
		if(isset(self::$tinymce_lang[$locale])) {
			return self::$tinymce_lang[$locale];
		} else {
			return preg_replace('/(_|-).*/', '', $locale);
		}
	}
	
	/**
	 * Provides you "likely locales"
	 * for a given "short" language code. This is a guess,
	 * as we can't disambiguate from e.g. "en" to "en_US" - it
	 * could also mean "en_UK". Based on the Unicode CLDR
	 * project.
	 * @see http://www.unicode.org/cldr/data/charts/supplemental/likely_subtags.html
	 * 
	 * @param string $lang Short language code, e.g. "en"
	 * @return string Long locale, e.g. "en_US"
	 */
	static function get_locale_from_lang($lang) {
		if(preg_match('/\-|_/', $lang)) {
			return $lang;
		} else if(isset(self::$likely_subtags[$lang])) {
			return self::$likely_subtags[$lang];
		} else {
			return $lang . '_' . strtoupper($lang);
		}
	}
	
	/**
	 * Gets a RFC 1766 compatible language code,
	 * e.g. "en-US".
	 *
	 * @see http://www.ietf.org/rfc/rfc1766.txt
	 * @see http://tools.ietf.org/html/rfc2616#section-3.10
	 * 
	 * @param string $locale
	 * @return string
	 */
	static function convert_rfc1766($locale) {
		return str_replace('_','-', $locale);
	}
	
	/**
	 * Given a PHP class name, finds the module where it's located.
	 * 
	 * @param  string $name
	 * @return string
	 */
	public static function get_owner_module($name) {
		$manifest = SS_ClassLoader::instance()->getManifest();
		$path     = $manifest->getItemPath($name);

		if (!$path) {
			return false;
		}

		$path = Director::makeRelative($path);
		$path = str_replace('\\', '/', $path);

		return substr($path, 0, strpos($path, '/'));
	}

	/**
	 * Validates a "long" locale format (e.g. "en_US")
	 * by checking it against {@link $all_locales}.
	 * 
	 * To add a locale to {@link $all_locales}, use the following example
	 * in your mysite/_config.php:
	 * <code>
	 * i18n::$allowed_locales['xx_XX'] = '<Language name>';
	 * </code>
	 * 
	 * Note: Does not check for {@link $allowed_locales}.
	 * 
	 * @return boolean
	 */
	static function validate_locale($locale) {
		// Convert en-US to en_US
		$locale = str_replace('-', '_', $locale);
		return (array_key_exists($locale, self::$all_locales));
	}

	/**
	 * Set the current locale, used as the default for 
	 * any localized classes, such as {@link FormField} or {@link DBField}
	 * instances. Locales can also be persisted in {@link Member->Locale},
	 * for example in the {@link CMSMain} interface the Member locale
	 * overrules the global locale value set here.
	 * 
	 * @param string $locale Locale to be set. See http://unicode.org/cldr/data/diff/supplemental/languages_and_territories.html for a list of possible locales.
	 */
	static function set_locale($locale) {
		if(!self::validate_locale($locale)) throw new InvalidArgumentException(sprintf('Invalid locale "%s"', $locale));
		
		if ($locale) self::$current_locale = $locale;
	}

	/**
	 * Get the current locale.
	 * Used by {@link Member::populateDefaults()}
	 * 
	 * @return string Current locale in the system
	 */
	static function get_locale() {
		return (!empty(self::$current_locale)) ? self::$current_locale : self::$default_locale;
	}
		
	/**
	 * This is the "fallback locale", in case resources with the "current locale"
	 * (set through {@link set_locale()}) can't be found.
	 * 
	 * If you just want to globally read/write a different locale (e.g. in a CMS interface),
	 * please use {@link get_locale()} and {@link set_locale()} instead.
	 * 
	 * For example, {@link Requirements::add_i18n_javascript()} and {@link i18n::include_by_class()}
	 * use this "fallback locale" value to include fallback language files.
	 * 
	 * @return String
	 */
	static function default_locale() {
		return self::$default_locale;
	}
	
	/**
	 * See {@link default_locale()} for usage.
	 * 
	 * 
	 * @param String $locale
	 */
	static function set_default_locale($locale) {
		if(!self::validate_locale($locale)) throw new InvalidArgumentException(sprintf('Invalid locale "%s"', $locale));
		
		self::$default_locale = $locale;
	}
	
	/**
	 * Include a locale file determined by module name and locale 
	 * 
	 * @param string $module Module that contains the locale file
	 * @param string $locale Locale to be loaded
	 */
	static function include_locale_file($module, $locale) {
		if(!self::validate_locale($locale)) throw new InvalidArgumentException(sprintf('Invalid locale "%s"', $locale));
		
		if (file_exists($file = Director::getAbsFile("$module/lang/$locale.php"))) include_once($file);
	}

	/**
	 * Includes all available language files for a certain defined locale
	 * 
	 * @param string $locale All resources from any module in locale $locale will be loaded
	 * @param boolean $load_plugins		If true (default), load extra translations from registered plugins
	 * @param boolean $force_load		If true (not default), we force the inclusion. Generally this should be off
	 * 									for performance, but enabling this is useful for interfaces like
	 * 									CustomTranslationAdmin which need to load more than the usual locales,
	 * 									and may need to reload them. 
	 */
	static function include_by_locale($locale, $load_plugins = true, $force_load = false) {
		if(!self::validate_locale($locale)) throw new InvalidArgumentException(sprintf('Invalid locale "%s"', $locale));
		
		global $lang;

		$base = Director::baseFolder();
		$topLevel = scandir($base);

		foreach($topLevel as $module) {
			// $topLevel is the website root, some servers are configured not to allow excess website root's parent level
			// and we don't need to check website root's parent level and website root level for its lang folder, so
			// we skip these 2 levels checking.
			if($module[0] == '.') continue;

			if (
				is_dir("$base/$module")
				&& file_exists("$base/$module/_config.php") 
			  && file_exists($file = "$base/$module/lang/$locale.php")
			) {
				if ($force_load) include($file);
				else include_once($file);
			}
		}
		
		// Load translations from themes
		$themesBase = $base . '/themes';
		
		if(is_dir($themesBase)) {
			foreach(scandir($themesBase) as $theme) {
				if(
					strpos($theme, SSViewer::current_theme()) === 0
					&& file_exists($file = "$themesBase/$theme/lang/$locale.php")
				) {
					if ($force_load) include($file);
					else include_once($file);
				}
			}
		}

		// Finally, load any translations from registered plugins
		if ($load_plugins) self::plugins_load($locale);
	}

	/**
	 * Given a class name (a "locale namespace"), will search for its module and, if available,
	 * will load the resources for the currently defined locale.
	 * If not available, the original English resource will be loaded instead (to avoid blanks)
	 * 
	 * @param string $class Resources for this class will be included, according to the set locale.
	 */
	static function include_by_class($class) {
		$module = self::get_owner_module($class);

		if(!$module) user_error("i18n::include_by_class: Class {$class} not found", E_USER_WARNING);
		$locale = self::get_locale();
		
		if (file_exists($file = Director::getAbsFile("$module/lang/". self::get_locale() . '.php'))) {
			include($file);
		} else if (self::get_locale() != self::$default_locale) {
		        $old = self::get_locale();
			self::set_locale(self::$default_locale);
			self::include_by_class($class);
			self::set_locale($old);

		} else if(file_exists(Director::getAbsFile("$module/lang"))) {
			user_error("i18n::include_by_class: Locale file $file should exist", E_USER_WARNING);
		}

		// If the language file wasn't included for this class, include an empty array to prevent
		// this method from being called again
		global $lang;
		if(!isset($lang[$locale][$class])) $lang[$locale][$class] = array();
		
	}
	
	//-----------------------------------------------------------------------------------------------//

	/**
	 * This variable holds translation plugins that are invoked on a call to _t. It is a two dimensional array,
	 * priority the first dimension and name the second, mapping to the callback.
	 * Translations from lower priority plugins are used first, and callback is a callback for call_user_func_array.
	 *
	 * Callback functions are passed one parameter:
	 * - locale string
	 * The callback function should return an array that can be merged with $lang[$locale], overriding values read
	 * from the language file.
	 *
	 * @var array
	 */
	private static $plugins = array();

	/**
	 * Register a named translation plug-in function.
	 * Plug-ins are assumed to be registered before any call to _t. If registered after a call to _t
	 * for a given local, it will not be called.
	 * @static
	 * @throws Exception
	 * @param  $name		String		A unique name for the translation plug-in. If the plug-in is already registered,
	 * 									it is replaced, including if its a different priority.
	 * @param  $callback				A callback function as given to call_user_func_array.
	 * @param int $priority				An integer priority, default 10.
	 * @return void
	 */
	static function register_plugin($name, $callback, $priority = 10) {
		// Validate
		if (!is_int($priority)) throw new Exception("register_plugin expects an int priority");

		// Ensure it's not there. If it is, we're replacing it. It may exist in a different priority.
		self::unregister_plugin($name);

		// Add it.
		self::$plugins[$priority][$name] = $callback;
	}

	/**
	 * Unregister a plugin by name.
	 * @static
	 * @param  $name	String		Name of previously registered plugin
	 * @return Boolean				Returns true if remove, false if not.
	 */
	static function unregister_plugin($name) {
		foreach (self::$plugins as $priority => $plugins) {
			if (isset($plugins[$name])) unset(self::$plugins[$priority][$name]);
		}
	}

	/**
	 * Load any translations from registered plugins. Merges them directly into $lang.
	 * @static
	 * @param  $local
	 * @param  $value
	 * @return void
	 */
	static function plugins_load($locale) {
		// sort the plugins by lowest priority (highest value) first, as each one replaces translations of the provider
		// before it.
		krsort(self::$plugins);
		foreach (self::$plugins as $priority => $plugins) {
			foreach ($plugins as $name => $callback) {
				self::merge_locale_data($locale, call_user_func_array($callback, array($locale)));
			}
		}
	}

	/**
	 * Merge an extra of language translations into $lang[$locale]. We'd use array_merge_recursive, except
	 * it doesn't work for translations that specify priorities and comments, because they are indexed by number.
	 * @static
	 * @param $locale String		The locale we are merging into
	 * @param $extra Array			An array of [locale][class][entity]=> translation, keyed on entity, that are to be
	 * 								merged for this locale.
	 * @return void
	 */
	static function merge_locale_data($locale, $extra) {
		global $lang;
		if (!$extra || count($extra) == 0 || !isset($extra[$locale])) return;
		foreach ($extra[$locale] as $class => $entities) {
			foreach ($entities as $entity => $translation) {
				$lang[$locale][$class][$entity] = $translation;
			}
		}
	}
}

?>