The language entry for the text that is displayed when a PM was deleted before being read has a disagreement, in my opinion, between verb tenses.
here is the language: "This message has been removed by its author before it was delivered."
Here is an explanation on the use of "has/have been" vs "was": http://www.english-test.net/forum/ftopic41383.html
In my opinion, "has been" should be changed to "was", "removed" should be changed to "deleted" (since that is what happened), and the ending should be removed, since it is obvious that it was not delivered. Here is how I think it should read:
"This message was deleted by its sender."
The main issue in this ticket is the change of "has been" to "was", so at the very least that is what I would like to see changed. The other changes are really just what I feel make it sound better, but aren't really as important.