Standardize translation of Doc/bugs.rst

[StanFromIreland]

PEP 545 (and soon, the devguide with my PR) states that:

... bugs.html [should be translated] with proper links to the language repository issue tracker.

There is however, no clear way of doing this, and it is sometimes not added at all. I therefore propose to add a section that will only appear in translations and the gettext builder, that will allow for this to be standardized.

The tag will also be useful in other places, namely @nedbat's "Improve this page" page (#136246)

I have verified that this will work with docsbuild-scripts.

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📚 Documentation preview 📚: https://cpython-previews--137449.org.readthedocs.build/

[adorilson]

Amazing.

Often, I miss information that only makes sense in translations.

[m-aciek]

I like this approach. It makes the translation consistent.

It's worth noting, that as a follow-up PEP 545 should have "proper links to the language repository issue tracker" note removed.