Update references
I accidentally replaced the name of one author with another one. I now have nearly 100 wrong references. Is there a way to revert them back to what they were (other than manually...)?
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Batch editing requires some javascript hacking. If you know javascript, https://www.zotero.org/support/dev/client_coding/javascript_api#batch_editing should get you there. Otherwise, this is going to look rather intimidating and you're likely better off doing it by hand.
Generally this is planned as a feature. It's obviously useful.