Why incomplete? Don't give up... finish your finnish, and send it to datahell.
Yes, I know... installer language is a little bit tricky. Anyway, as datahell said, it will be impossible to change language pack afterwards, so it is better to think for one more day, then to publish unfinished file. I was doing translation for two days, although it could be done in a couple of hours! And don't bother to translate words like Magic quotes, Register Globals, etc. People who know what these settings are used for will understand them better in english, anyway.