Bug 20347: Add missing classes to search results elements

Bug 20347: Add missing classes to search results elements

The MARC21 XSLT doesn't add html classes to distinguish between
certain elements, and there's no way to rely on the element
positioning, making it impossible to style the elements with CSS.

Add the missing classes to distinguish the elements.

Test plan:
1) Apply patch
2) Search for any biblios
3) Check the search result page table HTML to see that the
   "Publisher", "Edition", "Source", "Other title", and "Online access"
   are wrapped in a span with class of results_summary and one
   of "publisher", "edition", "source", "other_title", and
   "online_access"
4) Check that the search results of the elements above looks correct
   when compared to the other elements

Signed-off-by: Pasi Kallinen <pasi.kallinen@joensuu.fi>
Signed-off-by: Sebastian Hierl <s.hierl@aarome.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>