Make Status and Notification popup consistent with others.

Summary:

1. Remove the left margin.
2. Change '&' to "and".

Before:

After:

Test Plan: Open System Tray.

Reviewers: VDG, broulik, Plasma, mart

Reviewed By: VDG, Plasma, mart

Subscribers: fabianr, abetts, loh.tar, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D17556