To replicate, create a view of type User. Set it to fields and add the "Privatemsg: Send Privatemsg link" field. There is no option to alter (or, more importantly, hide) the label.
You can get around this by building your own private message link using UID, but it would be cool if this feature worked properly. =)
Closed: outdated
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It's likely this issue predates Contrib.social: some issue and comment data are missing.