Make Breeze theme tooltip texts consistent and rename Breeze Snow cursors to Breeze Light

Summary: Improve wording and make texts consistent with others.

Test Plan: Open the Curors KCM and hover over Breeze or Breeze Light.

Reviewers: Plasma, VDG, ngraham, rooty

Reviewed By: VDG, ngraham, rooty

Subscribers: ngraham, VDG, plasma-devel, Plasma

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D19046