I said they were what I created. They are not officially supported. Also I believe the language name has to be written the same as however you wrote it in the languages section of the editor.
The keywords bit themselves are not case sensitive. I'm not sure about the values section.
If it's not automatically registering
Language = English then it could be a bug in the build. I've always manually set it with Lua script when I read from the config.ini, so I couldn't say for sure.
By the way have you created a config.ini in the localAppDir... folder? or whichever folder it should be created in based on your OS.
When you build / compile your game, it gives you a config.ini file which can be read from the initial time your game is launched. This should only contain the basic minimum as the config.ini script will not read from that. It only reads the config.ini located in localAppDir folder.
Remember that you can find out where the localAppDir folder is located on your machine by opening up the console with TAB, then typing...
exec print( localAppDir )
press enter, then type...
press enter again to show the messages.log information & locate your localAppDir.