Lotus 1.9.0

Cover art from MusicBrainz downloads again, after being broken since 1.5.0. OPUS files can now carry cover art, and editing tags no longer throws it away.

Also:
- Now in Spanish and Simplified Chinese
- Smart Shuffle rebuilt to spread artists out
- Unplayable files say why instead of failing silently
- MusicBrainz results ranked and de-duplicated
- Ignore single-track albums; reduce lyrics animation
- Track menu in global search
- Fixed a crash on playlists holding a track twice
