Add Belarusian translate

[saivan4ick]

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• Have you explained what your changes do, and why they add value to the Guides?

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[saivan4ick]

I’d like to explain that this translation is necessary because, as a Belarusian like many other people and developers interested in open source and this guide I would like to have a translation of this excellent open-source guide in my native language. Although Russian is also recognized as an official language in our constitution, I and many others still prefer to read and understand texts in our true native language Belarusian.
I hope you understand my point of view.

[kenyonj]

Thanks for the contribution! Could you remove the gemfile changes so this is a translation only PR?
Дзякуй!

[saivan4ick]

@kenyonj I created the initial Gemfile, but it returned an error related to 403 errors. Or, if that’s not what you asked for, could you please explain what you were looking for?