translations: remove duplicated translation file for Norwegian Bokmål
According to http://people.skolelinux.org/pere/blog/Spr_kkoder_for_POSIX_locale_i_Norge.html
nb_NO should be used as it is correct one instead of nb.
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According to http://people.skolelinux.org/pere/blog/Spr_kkoder_for_POSIX_locale_i_Norge.html
nb_NO should be used as it is correct one instead of nb.