Update torlauncher translation setup
Torlauncher's setup needs to be updated. The repository is now https://gitlab.torproject.org/tpo/applications/torbrowser-launcher and we need to add it to weblate.
We also need to know if we still need this other tor-launcher branches: https://gitlab.torproject.org/tpo/translation/-/branches?state=all&sort=updated_asc&search=launcher and if not, move them to the attic.