rename tags per library

Hi all,
i have a problem and a feature request that maybe others have too. I collaborate in a group and this group works in a different language than my library is set up (my library is in German, the group in English). I have moved several hundred citations from my library into the group library. Now I would like to change all the tags of the items in the group.

I thought I could simply display the tags in the tag selector and then rename the tags by translating them from German to English. But when I do so, all the items, even those in my main library are changed. Would it be possible, that the rename tag function could be set to only relate to the tags related to a given library? or is there something I miss?
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