There should be default and sample data for Norwegian installations, modelled on the files in installer/data/mysql/en/mandatory/ and installer/data/mysql/en/optional/.
A proposed fix is available at: http://github.com/MagnusEnger/kohawork/ bug6002-sample-data
...and all the default and sample data has been installed here: http://kohanor33.bibkat.no/ http://kohanor33.bibkat.no:8080/ (demo + demo)
I have pushed this directly, it doesn't touch anything else, and I'm not able to critique Norwegian :)
This bug is mentioned in: Bug 6002 - Norwegian default and sample data - Request to pull http://lists.koha-community.org/pipermail/koha-patches/2011-March/014341.html
Guess no one else is in a hurry to close this, so I'll do it (even though I'm the patch writer). The changes introduced have been in production for a good while now.