Consistently use text "Configure..." for applet configure buttons
Summary:
Applets which need initial configuration display some centered button
to noth indicate the status as well as help the user to quickly get
to the configuration page.
Having consistent text on those buttons improves UX.
Reviewers: Plasma, broulik
Reviewed By: Plasma, broulik
Subscribers: broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D12313