Use Move / Rename instead of Rename in the UI for Move / Rename

There's a bit of UI inconsistency right now: for moving or renaming a page you click on a "Move / Rename" link from the more actions menu, but then the UI talks about "Rename" for the main button and the hint of the source, but about "move" for the hint of the location.

This should all be clarified.
Note: the wording must be unified with the move/rename of attachments.