Move $mozillaorg to locales.inc.php, add back nn-NO

* No point in having $mozillaorg in an untracked file like
settings.inc.php, moved it to locales.inc.php
* Add back nn-NO: we need it for download page (firefox/new.lang), no
point in tracking only some files.
Merge pull request #219 from flodolo/fix_nnNO

Move $mozillaorg to locales.inc.php, add back nn-NO