Bug 37192: Add ability to pass data-new_tab to form-submit.js and open in new tab

Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 4c244df82a)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/form-submit.js

@@ -30,6 +30,9 @@ $(document).ready(function () {
                 })
             );
         });
+        if (form_data.new_tab) {
+            the_form.attr("target", "_blank");
+        }
         $("body").append(the_form);
         the_form.submit();
     });