Add Norwegian Bokmål translation.
Add Norwegian Bokmål translation.

Patch by: Øyvind Møll <oyvind@moll.no>

* subversion/po/nb.po: New file.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion