I have tested the single restore; it works but remains orphan so no more hope. I leave as it is.
I'm really sorry for that. I would gladly do the work to manually restore each translation unit. But if I'm going to do that anyway, I would rather do it on the migrated version in the Community Wiki as those should be (based on a decision made years ago) the final home of those FAQs.
Thank you again for your contributions in translating our docs. I hope this blunder of mine won't discourage you and others from continuing the much-needed work.