Bug 28180: Restore NO_LOCAL_JACKET

This is a patch to squash. No idea what it got removed previously

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/opac-tmpl/bootstrap/en/includes/opac-bottom.inc

@@ -262,6 +262,11 @@ $.widget.bridge('uitooltip', $.ui.tooltip);
 
 [% IF OPACLocalCoverImages %]
     [% Asset.js("js/localcovers.js") | $raw %]
+    <script>
+
+    var NO_LOCAL_JACKET = _("No cover image available");
+
+    </script>
 [% END %]
 
 [% IF ( BakerTaylorEnabled ) %]