Word wrap "No backends found" error message
Summary: This makes the complete error message visible if the window is small, for example on Plasma Mobile
Test Plan: Error message is word wrapped.
Reviewers: Discover Software Store, ngraham
Reviewed By: Discover Software Store, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D20674