Bug 11495: Make "Select titles to: " translatable

Bug 11495: Make "Select titles to: " translatable

Fixes translation of "Select titles to: " on the Bootstrap
OPAC result page.

Test plan:
- Update one of the po files running:
  perl translate update <langcode>
- Verify that "Select titles to: " is only listed once for
  search-results.tt
Apply patch
- Verify addings titles to lists and cart from the result list
  still works as expected
- Rerun the po file update
- Verify the string is now listed twice for search-results.tt

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 133746136cb1c8b2f2ab1d1c08650369ca4b9ee8)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>