diff --git a/thirdparty/tinymce-advcode/langs/cs.js b/thirdparty/tinymce-advcode/langs/cs.js
index 00338a64c..dd0e2936b 100644
--- a/thirdparty/tinymce-advcode/langs/cs.js
+++ b/thirdparty/tinymce-advcode/langs/cs.js
@@ -1,3 +1,3 @@
-tinyMCE.addI18n('en.advcode',{
+tinyMCE.addI18n('cs.advcode',{
   desc : 'Editovat HTML zdrojový kód'
 })
diff --git a/thirdparty/tinymce-advcode/langs/cs_dlg.js b/thirdparty/tinymce-advcode/langs/cs_dlg.js
index 878648108..f8dc55413 100644
--- a/thirdparty/tinymce-advcode/langs/cs_dlg.js
+++ b/thirdparty/tinymce-advcode/langs/cs_dlg.js
@@ -1,4 +1,4 @@
-tinyMCE.addI18n('en.advcode_dlg',{
+tinyMCE.addI18n('cs.advcode_dlg',{
   title : 'HTML Editor zdrojového kódu',
   number_toggle : 'Čísla řádků'
 })