Add a 'revdelete-selected-file' message on Special:RevisionDelete

This allows a file adjusted message when delete file versions and can
make clear the difference between deleting a revision of the file
description page or a version of the file.

Also renamed 'revdelete-selected' to 'revdelete-selected-text' to be
able to reorder the params, this allows using the same code for each
type (log, text and file)

Change-Id: I02514eda2f267ede16b4298ed5cae64c6787f79d
Merge "Add a 'revdelete-selected-file' message on Special:RevisionDelete"