Release 0.99.9.3

  - data/org.ArcticaProject.arctica-greeter.gschema.xml: Set
    menubar-alpha default to 0.3. (Originally 0.2, changed to 0.5 as
    part of 2bc439d3, now back to a compromise).
  - Apply custom menubar transparency even if theme background is used.
  - Use the theme menubar background colour if no custom colour is
    specified.
  - Translation updates (thanks to all contributors on
    hosted.weblate.org).
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