This reverts commit 5ef867caba.
In the end we take a different approach for the class reference localization,
which no longer involves including Weblate PO files in this repo but instead
the generated rst files after running l10n versions of `--doctool` and
`make_rst.py` in the engine repository.
They're the generated files we use to build the docs with Sphinx,
so we can save some diff and disk space on future updates by not
including this info.
It's only relevant to keep for Weblate files to let translators
find their way to the original text.
Building for each lang takes several minutes, so saves a lot of build time.
More langs will be added as they are more complete and a Read The Docs instance
is created for them.
We need to list templates in their table of contents order
if we want the monolithic POT file to match the order of
the documentation, which is more translator-friendly than
an folder-wise alphabetical ordering of POT files.
The logic is hacky and requires a prebuilt index.html from
the docs repo, but it works™.
