Ok guys. I had a look at this and found the issue (and already fixed it). You can check out the changes here:
http://tools.assembla.com/mylansite/changeset/265
If you want the fix, download the two changed files from the above link and replace them on your installation (make sure you are on the latest 2.0.4 version first).
The issue was: The labels for the fields is written to the config file, but the config file is never updated and you had no way of doing so. After you placed the fixed files in your installation, it will still not automatically change. What you have to do after placing the files is: Go to the events configuration screen again. You should now see your Norwegian titles for the fields. Then click "Save" to make sure the Norwegian titles are written to your config. After that, things should work just fine.
Let me know if you still have issues.