Features:
* "Do not disturb" mode
* Notification-muting on a per application level
Bugs fixed:
* Add hidden option "primary-monitor" to set screen for notifications
(Bug #10003)
* Fix theming issues with Gtk 3.22
Updated translations: Bulgarian, Catalan, Chinese (China), Chinese
(Taiwan), Croatian, Czech, Dutch (Flemish), English (Australia), French,
German, Hebrew, Kazakh, Lithuanian, Malay, Polish, Portuguese, Portuguese
(Brazilian), Russian, Slovak, Spanish, Ukrainian