Fix localization of the systemmonitor widget configuration window
Summary:
Currently, the common config window messages are neither extracted nor used in all 5 widgets. It is not possible to add several translation catalogs for a single QML widget thus the messages are extracted into all 5 widget catalogs.
Idea of the fix by Victor Ryzhykh.
Test Plan: Extraction tested to work as expected, translation should work too.
Reviewers: Localization, Plasma, davidedmundson, ngraham
Reviewed By: Plasma, davidedmundson, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D26192