Major changes in 43.1:
- Fix scroll-by-page GTK setting breaking slider
- Fix a number of MPRIS playback controls not working correctly
- Fix a number of opensubtitles dialogue problems
- Fix hyphens appearing in filenames
- Force using newer GStreamer va-api plugins, fixing scrambled videos
  in some cases
- Fix error showing the keyboard shortcuts
- Fix assertion when backends send out audio or image files
  even though we asked them to be filtered out
- Translation updates