Fixed #11068 - Introduced new language code "nb" for Norwegian Bokmål as a...

Fixed #11068 - Introduced new language code "nb" for Norwegian Bokmål as a replacement of the current "no".

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13047 bcc190cf-cafb-0310-a4f2-bffc1f526a37