If you are interested in providing a translation for your native language, it would be most welcome. Experience with Unix is a plus, but if you need extra help I'd be happy to help you in private. For now, get LogJam from CVS (instructions are at http://logjam.danga.com) and look at the gettext manual, particularly Creating a New PO File and The Format of PO Files. It's really not too complicated: you take a file with a list of strings in English and you provide strings in your language.
Feel free to comment if you're interested, and perhaps find other people working on the same language as you?
(Back in Windows-land, I've done some work integrating GTK2 with Windows XP themes; you can see a screenshot of that on my journal.)
(This picture was stolen from gaal's post here.)