Use python-babel instead of xgettext and msgfmt

[ericwb]

Is your feature request related to a problem? Please describe.
Translation of strings is a bit cumbersome with xgettext and msgfmt, especially when strings change or new ones are added.

Describe the solution you'd like
I'd like to make use of pure python code instead of Linux gettext. Python Babel seems to fit well.

One problem, Babel doesn't work with f-strings. So need to get rid of f-string translated strings.

Also, ideally the translation of the *.po files could be automated using ChatGPT so that isn't manual either.

Describe alternatives you've considered
gettext, msgfmt, etc

Additional context
https://babel.pocoo.org/en/latest/setup.html

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