Bug 11488: make string "Are you sure you want to write off ..." translatable

Test plan:
- ./translate update LANG
- translate the string into your po file
- ./translate install LANG
- Verify the string is translated.

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>

koha-tmpl/intranet-tmpl/prog/en/modules/members/pay.tt

@@ -16,7 +16,9 @@ function enableCheckboxActions(){
     $(document).ready(function(){
  $('#pay-fines-form').preventDoubleFormSubmit();
         $("#woall").click(function(event){
-            var answer = confirm(_("Are you sure you want to write off [% total | format('%.2f') %] in outstanding fines? This cannot be undone!"));
+            var msg = _("Are you sure you want to write off %s in outstanding fines? This cannot be undone!");
+            msg = msg.replace( "%s", "[% total | format('%.2f') %]" );
+            var answer = confirm(msg);
                 if (!answer){
                     event.preventDefault();
                 }