Create client.nb_NO.yml

Norwegian translation first take.
Update client.nb_NO.yml

Started work on "invited" translations.
Update client.nb_NO.yml

First post, Mute, Unmute, Last post, are they meant to be translated?

finished down to composer
Update client.nb_NO.yml

down to line 509. Gotta read up on /js_local_helper_spec.rb before continuing.
Merge pull request #1035 from erlend-sh/master

WIP: Added Norwegian Bokmål translation, 50%