Merge from trunk
[ Alberto Mardegan ]
* Immediately accept degenerate requests from unconfined processes
(LP: #1582824)
* Replace incorrect usage of UbuntuColors (LP: #1581047)
* Update pot file for translations (LP: #1533091)
* Open popups in an overlaid webview (LP: #1428591)
* Skip tests on arm64 (LP: #1585942)
[ Alberto Mardegan, Timo Jyrinki ]
* Stop depending on transitional packages. (LP: #1583079)