Bug 24690: Make OPACPopupAuthorsSearch work with search terms containing parenthesis

This patch updates the OPACPopupAuthorsSearch feature so that it wraps
search terms with quotes. This is the behavior we have in place for
author searches outside the context of OPACPopupAuthorisSearch, e.g.
'au:"Criterion Collection (Firm)"'

To test, apply the patch and enable the OPACPopupAuthorsSearch system
preference.

- Search for a record in the OPAC which has author data containing
  parentheses (it should not be a field linked to an authority record).
- View the detail page for that record.
- Click on one of the problematic author links.
- This should trigger a modal window with a list of authors and
  checkboxes for each.
- With just the single checkbox checked, click "Search."
- The search should return the correct results.
- Test other author searches to confirm that they work too.

Sponsored-by: Athens County Public Libraries
Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

koha-tmpl/opac-tmpl/bootstrap/en/modules/opac-detail.tt

@@ -1966,7 +1966,7 @@
                                 authid = $(this).data("authid");
                                 search_string = "an:" + authid;
                             } else {
-                                search_string = terms[term]["keyword_search"] + encodeURIComponent( search_label );
+                                search_string = terms[term]["keyword_search"] + '"' + encodeURIComponent( search_label ) + '"';
                             }
                             var termLink = $("<li>")
                                 .append( $("<input>", { type: "checkbox", class: "select_term", value: search_string, id: terms[term]["label"] + index } ).prop("checked", preselected ) )