Code review comment for lp:~trb143/openlp/servicing

Two or three of suggestions:

Line 147
    - Does it need to be MediaMediaItem - looks a bit weird?
    - Also, should be Select Media item(s)' - the (s) in the wrong place :)
Line 149
   - should be something like self.parent.config.get_last_dir(), u'Media Files (*.avi *.mpeg)')... do we need more file extensions (or sets of) in here, for audio, and other video? And a *.* option?
line 271
   - MediaMediaItem as well
and line 297