This release fixes a showstopper regression for Gtk<=3.18 users where
  no notifications would be displayed (Bug #12823).

  Features:
    * Add support for symbolic icons
    * Add two new themes: Bright and Retro
    * Improvements to the existing themes

  Bugs fixed:
    * Fix client pointer with Gtk+ < 3.20 (Bug #12823)
    * Sort the themes alphabetically in the Settings Dialog

  Updated translations: Polish
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