For information, I’m currently blocked for the upgrade as I found a possible regression: I’m waiting some feedback from Weblate team to proceed, the server remains down for now. I’ll keep you informed if I rollback the upgrade or if I continue it depending on the feedback.
Ok feedback was fast and I’ve been able to resume the migration: I’ve now finished the upgrade to Weblate 2026.9.1, https://l10n.xwiki.org is up again and you can resume work on it.