MDL-22084 making a clear distinction between list of our translations and list of all languages defined in ISO 639-2

lib/adminlib.php

@@ -3517,7 +3517,7 @@ class admin_setting_langlist extends admin_setting_configtext {
      */
     public function write_setting($data) {
         $return = parent::write_setting($data);
-        get_list_of_languages(true);//refresh the list
+        //TODO: reset lang cache
         return $return;
     }
 }