Added missing single quotes to the Norwegian nb.po file.
Added missing single quotes to the Norwegian nb.po file.

* subversion/po/nb.po
  Added some missing '' (single quotes) to the Norwegian messages.

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