New "dynamic" i18n menu.

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!

source/gameengine/GamePlayer/ghost/GPG_ghost.cpp

@@ -1064,6 +1064,7 @@ int main(int argc, char** argv)
 
 #ifdef WITH_INTERNATIONAL
 	BLF_free_unifont();
+	BLF_lang_free();
 #endif
 
 	IMB_exit();