Summary:
BUG: 386571
BUG: 386574
BUG: 386576

Implemented some of @abetts' string change and UI suggestions in the above bugs.

Test Plan:
Tested in KDE Neon:

{F5540279}

{F5540277}

{F5540278}

Reviewers: abetts, #vdg, #kwin, davidedmundson, graesslin, apol

Reviewed By: abetts, #vdg, davidedmundson, apol

Subscribers: apol, jriddell, luebking, graesslin, kwin, abetts

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D8682