Make grit aware that nb and no language codes are equivalent.

Translation console uses non-standard language codes 'iw' and 'no'
for Hebrew and Norwegian Bokm\u00e5l instead of 'he' and 'nb' used in
Chrome. Previously grit handled that properly for Hebrew, but not
for Nerwegian Bokm\u00e5l.

Patch by Sergey Ulanov at
https://codereview.chromium.org/235893002/



git-svn-id: http://grit-i18n.googlecode.com/svn/trunk@161 7262f16d-afe8-6277-6482-052fa10e57b1