Fixed. Copied all the language files and added suffix: nb-NO.

But another problem: The image upload button is disabled. Where do i change this? Something to do with path?

1 more question :-)
I don|t know exactly what it is called (the tools on top of screen when logged on as admin? From where you add modules etc.) The layout is changed in the fresh installed site. But remains like it always have been in the upgraded site.

Anyone know if it's possible to remove the text "Alpha Version" from the browser's menu bar?   Here's a screen shot:

If it can't be removed by an end user like myself, does anyone know when some install packages will be made available?  This package is literally useless to me this way.