Make feedback-related strings accurate
Summary:
Prior strings were inaccurate (I was the one who changed it, sorry about that)
and talked about visual feedback for something that was actually about audio
feedback. Adjust strings to be clearer and actually accurate.
Test Plan:
Reviewers: VDG, nicolasfella, drosca
Reviewed By: nicolasfella
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D22046