LP#1755543: Add help tips to Print Item Labels Settings tab

LP#1755543: Add help tips to Print Item Labels Settings tab

Instead of providing lengthy settings descriptions, which result in a lot of
scrolling on the Print Item Template page, let's use help tips that can
provide guidance to new users without adding clutter to the interface.

This commit also turns the field labels into HTML labels for improved
accessibility and removes borders on the page. The borders were helpful
when we displayed the help text on the page, but are no longer needed.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>