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