translation: Remove duplicated language file for Norwegian Bokmål
I tried to add this to Weblate and it failed, because it says: "There is more than one file for Norwegian Bokmål". I was looking what we should use - nb or nb_NO. I found this page: http://people.skolelinux.org/pere/blog/Spr_kkoder_for_POSIX_locale_i_Norge.html
Where it says that nb should not be used and we should use nb_NO