added Norwegian Bokmål (nb) language

[zeusbaba]

No description provided.

[jama5262]

@zeusbaba Hi, thanks for your contribution. A few changes I would request

1. Please send PRs to develop branch and not the master branch
2. Write tests for your locale

[zeusbaba]

fyi. just updated with tests and base branch.

[jama5262]

@zeusbaba Thanks but the travis CI test failed because of not formating your code, please use dart-formater for all the files you added or changed. Dart formatting is required so that the tests could pass

Use this to check for any none formatted files

dartanalyzer lib test example && dartfmt -n --set-exit-if-changed lib test

[zeusbaba]

thanks for your feedback. I'll do that soon together with a fix.
btw I just realized that there's another #61 for Norwegian language, apologies i missed that.