docs: add maintain-translations-in-your-repo.rst | FC-0012

[OmarIthawi]

Add translations maintenance document with few common problems.

This pull request is part of the FC-0012 project which implements the Translation Infrastructure update OEP-58.

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[OmarIthawi]

@brian-smith-tcril This is a document that overlaps with enable-translations-new-repo.html.

I haven't added too much details but more of few problems and solutions and links to the document.

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