Do you mean with the "inline moderation" style actions? We always use plural there as it's referring to the selected conversations (even if there's only 1).
It just feels wrong since it's directly related to that single selection. But since there are two phrases (singular and plural) I thought it was a bug.
Yes I just noticed it as Mike posted it. I assume the benefits do not outweigh the disadvantages (lines of code/performance?) to transform to singular phrases in case of single selection.