D7202: change user visible text to use modern branding

[David Edmundson]

davidedmundson accepted this revision.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7202

To: jriddell, #plasma, davidedmundson
Cc: davidedmundson, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol, mart, lukas