Bug 15444 - MARC21: Repeated 508 not correctly formatted (missing separator)

 Bug 15444 - MARC21: Repeated 508 not correctly formatted (missing separator)

This patch adds a separator for multiple 508 fields to the XSLT display in the staff and OPAC detail view.
Separator is wrapped in span with class=‘separator’ for easy manipulation via css.

To test:
* Search the OPAC
* Click the title with multiple 508 fields
* Make sure the fields display properly
* Repeat for a few more titles
* Repeat in the Staff Client

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 1c5f75fde534db8a2b1329d5dfb83d34d9d29982)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>