Add language selector

[MacqGit]

Description / Summary

Would be nice if a "language selector" could have been added to the menu bar.
Looking into the code, I don't see this this feature implemented, but maybe I might be wrong

I also understand the caveats linked to this (e.g. where the actual .po files are located), but maybe a "framework" could be worked out and than every user could adapt to his/her needs.

Value / benefit

Multilingual support enabled

Implementation details

No response

Tasks to complete

No response

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[pradyunsg]

x-ref: pradyunsg/sphinx-basic-ng#12

[ka2in]

I would also like to have a language selector in the menu bar for multilingual support.