Make the action names consistently use action verbs

Summary:
The action names are inconsistent right now, a mixture of nouns and verbs.

This simple patch makes them all use action verbs, thereby following the HIG
(https://hig.kde.org/components/navigation/pushbutton.html#appearance)

Reviewers: apol, #vdg

Reviewed By: apol

Differential Revision: https://phabricator.kde.org/D18031