adding locale to roller

[Mike Liu]

Hi all,

I've successfully installed roller 4 rc10.  Unfortunately, it does not 
display some languages from its admin UI.  In particular, it doesn't 
have Mongolian language.

I have a hack to add the Mongolian language into the UI using Javascript 
-- which I don't really like.  What would be a better way to add new 
languages (locale) then?  Can someone point me to the right code to do this?

Thanks!
Mike