I got tired of seeing several stupid typos listed for the Norwegian Bokmål translation at URL:http://d-i.alioth.debian.org/spellcheck/, and fixed the grave ones in the Skolelinux CVS. Please update the d-i versions from URL:http://developer.skolelinux.no/cgi-bin/viewcvs.cgi/skolelinux/i18n/other/nb/, files debian-installer-post-sarge.po and debian-installer.po.
I tried to update the d-i files myself, but failed to find them in my copy of svn. :(