Bug 17221: Remove orphan commas in shelf browser

Bug 17221: Remove orphan commas in shelf browser

This patch adds more conditions to the shelf browser template
such that the displayed text reads as a proper list no matter
what combination of system preferences are utilized

Sponsored-by: California College of the Arts
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>