Bug 32679: Use different CSS classes for titles of article requests in staff interface

Bug 32679: Use different CSS classes for titles of article requests in staff interface

The class article-request-title was used for the column with the
article title as well as for the link with the record title. This could
cause some confusion when changing the table with CSS. This patch makes
it so different CSS classes are used for each.

To test:
* Activate article requests in system preferences
* Make sure circulation conditions have article requets = yes
* Create an article request in staff or OPAC
* View the list of article requests in the patron account in staff
* Add the following line to IntranetUserCSS:
  .article-request-title { display:none; }
* Verify the Title column and the title from Record title (first column)
  have vanished.
* Apply patch: now only the column should vanish, Record title shoudl remain
  visible
* If you want: Verify that the record title has a differently named
  class now.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>