[Merge] lp:~dgadomski/unity-settings-daemon/lp1755490 into lp:unity-settings-daemon

[Dariusz Gadomski]

It needs a separate fix for mutter [1]. I've prepared a patch for it [2]. It has been accepted, but I was told to wait until 3.32 due to introducing a new translation string.

[1] https://gitlab.gnome.org/GNOME/mutter/issues/292
[2] https://gitlab.gnome.org/GNOME/mutter/merge_requests/223
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https://code.launchpad.net/~dgadomski/unity-settings-daemon/lp1755490/+merge/346885
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