MBS-6377, ReleaseDisc.tracklist should contain the data loaded from the medium, without the release artist edited.
MBS-6377, move changeTrackArtist back to right after the /ws/js/medium response.
Merge branch 'mbs-6377' into beta

* mbs-6377:
  MBS-6377, move changeTrackArtist back to right after the /ws/js/medium response.
  MBS-6377, ReleaseDisc.tracklist should contain the data loaded from the medium, without the release artist edited.