Bug 3150: (follow-up) Improve and fix new notice templates

Bug 3150: (follow-up) Improve and fix new notice templates

This fixes several issues found and improves formatting:

* Add missing line breaks <br> where required as we are now using HTML
* Add missing USE statements to show
  * library
  * location
  * Link to the OPAC (Preference was not resolved)
* Make sure there is a comma between library and location
* Make sure Author(s): only displays when there is content after
* The comment field allows multi-line comments, formatting is now preserved

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>