Make Appearance KCMs' labels consistent
Summary:
With the purpose of making KCMs more consistent and following the HIG, this patch does the following:
- Converts all .desktop file "Comment" values into action(verb)-style labels
- Drops the use of articles in "Comment" values
- Changes the KAboutData i18n strings so that they match the respective KCM's name
Reviewers: GB_2, VDG, ngraham, Plasma
Reviewed By: GB_2, VDG, ngraham
Subscribers: davidedmundson, broulik, plasma-devel
Tags: Plasma
Maniphest Tasks: T10273
Differential Revision: https://phabricator.kde.org/D18903