Bug 26824: Use confirmation modal when removing titles from a list in the OPAC

Bug 26824: Use confirmation modal when removing titles from a list in the OPAC

This patch changes the process of removing a title from a list so that
it uses a confirmation modal dialog instead of a JavaScript alert.

To test, apply the patch and view the contents of a list in the OPAC.

 - Click the "Remove from this list" link under one of the titles.
 - You should see a modal confirmation message, "Are you sure you want
   to remove this item from the list?" It should show the title of the
   item on the list.
 - Test both the "Yes" and "No" choices.

 - Check the box next to one title on the list, and click the
   "Remove from list" link at the top of the table.
 - You should see a modal confirmation message, "Are you sure you want
   to remove this item from the list?" It should show the title of the
   item on the list.
 - Test boh the "Yes" and "No" choices.

 - Check the box next to multiple titles on the list and click the
   "Remove from list" link at the top of the table.
 - You should see a modal confirmation message, "Are you sure you want
   to remove these items from the list?" It should show the titles of
   all the records you selected.
 - Test both the "Yes" and "No" choices.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>