Add second line of text for KickerDash item descriptions

Summary:
Adds a second line of text under icon/doc icons for more clarity.
Will stop at two lines; if text continues, it will be elided.

BUG: 362986

Test Plan:
- Install Application Dashboard, identify a one-line elided item
- Apply patch and compile
- Check that item text is now two lines but does not overlap next row

Reviewers: ngraham, hein, #plasma

Reviewed By: ngraham

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D13122