Enable theme translation

[StanFromIreland]

Adds Polish to start. Based on @rffontenelle 's pr. This does not allow for translation of the Copy button for some reason, but I think that can be left for another time.

Result:

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📚 Documentation preview 📚: https://python-docs-theme-previews--246.org.readthedocs.build/

🇵🇱 Polish preview 🇵🇱

[rffontenelle]

Thanks for fixing what was missing with the solution!

[m-aciek]

Translation improvement suggestions, otherwise looks good to me 👍

[m-aciek]

Suggestion for better portability

[hugovk]

Looks about right, but I'd appreciate a PR approval from a translator as well.

And we can always iterate and fix as needed after an initial release.

[StanFromIreland]

Looks about right, but I'd appreciate a PR approval from a translator as well.

Maciek has already reviewed translation, see above.

[hugovk]

Looks about right, but I'd appreciate a PR approval from a translator as well.

Maciek has already reviewed translation, see above.

Yes, but not approved.

[StanFromIreland]

In hopes of getting this in faster, I can just delete it?

Fun fact, translations of the Python docs are actually not reviewed for most languages.

[StanFromIreland]

Preview! (built with -D language='pl')

[m-aciek]

Looks good! Thanks

[StanFromIreland]

It is no longer a follow up, it is now included in this PR!

Verified manually that the artefact has the compiled files.

[rffontenelle]

Sweet! Was setup-python really necessary, considering that python is already included in the GH runner image?

[StanFromIreland]

It is used in all other workflows in this repository when Python is needed.

[hugovk]

Thanks!