Design and document git hook to prevent the moving of 'core pages' without updating the core pages file
The translation platform got broken the other day (sysadmin ticket #17736) because we moved some files that were listed on wiki/src/contribute/l10n_tricks/core_po_files.txt.
This file is written by the website editors with the most important pages, and read by weblate to update the component list core-pages, used by translators to prioritise their work.
While debugging this problem, @zen started writing a git pre-commit hook that would alert editors when moving a page mentioned on the core_po_files.txt file, so they can also move it on the list.
Unfortunately it needs a bit more work to be used along other pre-commit hooks we already ship.
The pre-commit hook should work when pasted along other pre-commit hooks people could have, and there is already one on the /bin/ directory of the repo to prevent problems with .po files: https://gitlab.tails.boum.org/tails/tails/-/blob/stable/bin/pre-commit-translation
It would be also good to do it in a way that we can easily plug it into our CI some day, to increase the chances this gets spotted, ideally at merge request time, worst case post-merge, so we don't rely solely on "everyone who does technical writing has a given pre-commit hook enabled".
The current version of the patch can be downloaded here and the discussion on the previous ticket (sysadmin #17736) from here onwards is relevant to this ticket.