Now both UI translation menu (in userprefs) and isocodes are defined in a text file (release/datafiles/locale/languages), parsed at lunchtime. This way:
* No more need to edit Blender code each time we want to add an new language or reorganize the existing menu;
* Translators can easily add a new language for testing, by just editing the text file, so no more need to ask to change Blender code and wait for a new build to see your new translation work in Blender!
Remaining todo:
* Commit i18n py tools
* Update wiki doc!
b5e85cae70