Undo !
hi dear
i made a mistake and click on "copy terms to definitions" and now i want to undo but i can't.if may add undo ability for preventing future mistakes by users.
thX(*)

It would be a huge effort to build an ‘Undo’ system on every action a user of the system does (across all the accounts on the server).
For this particular case, you have the ‘Flush all definitions’ option that would remove all the translations in a language version.
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Luigi commented
Agreed that the undo is difficult but the feature is somehow dangerous.
I'd suggest to put a warning explaining exactly what is going to happen.In general I'd suggest to remove this feature from the general menu and put it close to every single sentence.