TinyMCE Editor Localization
TinyMCE uses simple text files to localize. There are two places you need to know when localizing Tiny: The general language directory and the specific language directory per plugin. You can look for both of them in:
General Language Directory
/path/to/your/campsite/javascript/tinymce/langs/
Plugin Language Directory
/path/to/your/campsite/javascript/tinymce/plugins/[name_of_plugin]/langs/
Creating a New Localization file
The easiest way is to copy the localization file for English language and edit it. Use the same file name convention as for the other languages, that is by using the ISO code for the language.
Edit the new file with your favorite text editor and save it.
File Format
These files can be edited with a simple text editor, however they are Javascript code, so please be aware of that and don’t change any syntax, just focus on translate the strings.