Batch deletion : replace "Delete and unshare" (weird) with "Delete and leave share(s)" (more relevant and clear)

When I select several folders and/or files, and among this selection some items have been shared with me, I think that “unshare” is misleading, because it may look like I'm the one who's going to “unshare”.

I think we need to be consistent with another wording that appears when you want to leave a share (see second screenshot below). It would be nice to replace it with: “Delete and leave share” or (event better IMO) “Delete and leave share(s)”. I think “share(s)” is more appropriate, as there may be one or more shares in the selection you're about to delete.

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Start by searching the frontend for the batch deletion confirmation text “Delete and unshare” and compare it with the existing leave-share wording shown in the issue. Update the relevant label so multi-selection uses the clearer “Delete and leave share(s)” wording, then verify the batch deletion dialog displays the new text consistently.