There was a bunch of broken references with the French and Tamil translations, and a single bad URL link for Hungarian. I also enabled pull request building of Spanish, Croatian, French, and Tamil. I also invited @amolenaar to be a maintainer on readthedocs for those extra translation components.

For translations that don't yet have their own readthedocs being built, I'm open to ideas on how we could build them to prevent errors accidentally added. To check a language, we can manually do:

$ python -m sphinx -T -W --keep-going -b html -d _build/doctrees -D language=LANG . _build/html

Where LANG is the two letter translation to build.

PR Checklist

Please check if your PR fulfills the following requirements:

• I have read, and I am following the Contributor guide
• I have read, and I understand the GNOME Code of Conduct

PR Type

What kind of change does this PR introduce?

• Bug fix
• Feature
• Chore (refactoring, formatting, local variables, other cleanup)
• Documentation content changes

What is the current behavior?

Doc builds fail for French and Tamil translations on readthedocs.

Issue Number: N/A

What is the new behavior?

Doc builds should now pass.

Does this PR introduce a breaking change?

• Yes
• No

Other information