added new language, small problem

Hi all, just installed Thai language on my W880i which I'm sending to my Thai girlfriend. The problem is that the language shows in the 'Writing language' menu and selects OK (can write txts in Thai) but it isn't showing on the 'Phone language' menu. I've done all the stuff like deleting language.dat and language.lst files and a major reset of the phone etc but cannot get it to show. Anybody any ideas on this?? is there another configuration file I can edit for the 'Phone language' menu??