FIX: Translation support in GitHub Actions

[AakashGfude]

• fix _compile_translations.py , so that .mo files are present in build folder
• add missing translations

fixes #584

[AakashGfude]

@choldgraf it seems I can only translate to 9 languages from smodin. Do you have a premium account? As it seems other words have translations in more languages.

[choldgraf]

Let's just go with the 9 languages - this is just a start anyway, I think that it will likely require manual updates for many languages anyway since automatic translating is likely to some things slightly incorrectly

[AakashGfude]

ooh okay cool. I reckon we need to find words manually of what we want to update. Some words already found are:-
Last updated on and By as mentioned in the issue #584 . So, I will just go with that for now.

[choldgraf]

Yeah that makes sense - we can do the best we can now, and if we miss something we can always improve it in a future PR !

[choldgraf]

By the way, do you know how to handle translation strings when there is a word that isn't supposed to be translated? Eg "edit on GitHub" - we want "GitHub" to be part of the phrase (so that for example German speakers see it at the beginning of the phrase instead of the end), but it isn't translatable. I think there are guidelines for how to handle this but I don't know what they are.

Ah i just remembered this PR might have some recommendations (though it uses gettext directly rather than our middle-layer custom translation stuff)

• DOCS: Add internationalization instructions pydata/pydata-sphinx-theme#1178

[AakashGfude]

By the way, Last updated on and By are already here https://github.com/executablebooks/sphinx-book-theme/tree/master/src/sphinx_book_theme/assets/translations/jsons . So, I guess we don't need to add any translations at the moment?

[choldgraf]

Ah nice - so we don't need to change anything for now? If that's the case I think we should just merge this and cut a release candidate

[AakashGfude]

Ah nice - so we don't need to change anything for now?

Seems like it. But I don't know why it was not working in the first place. Because of lack of .mo files?

[choldgraf]

Yes without those files present sphinx
Sphinx cannot generate any translations