Version 2.21.91
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Fixes
* Remove the various monitor backends, and unconditionnaly use gio
(Vincent)
Misc
* Do not install gnome-menu-spec-test, it's useless for the user
(Vincent)
* Add a hard dependency on gio (Vincent)
Translators
* Woodman Tuen (zh_HK)
* Woodman Tuen (zh_TW)
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