silverstripe-framework/tests/i18n/_fakewebroot/i18ntestmodule/code/subfolder/i18nTestSubModule.php

<?php

use SilverStripe\Core\Object;
class i18nTestSubModule extends Object {
	public function __construct() {
		_t('i18nTestModule.OTHERENTITY', 'Other Entity');

		parent::__construct();
	}
}