Bug 12937 [Follow-up] Deleting suggestions should ask for a confirmation

This minor follow-up revises the language a bit: Adding missing question
marks and using the more standard prompt "Please select at least one..."

To test, follow the previous test plan and confirm that the prompts are
improved:

- go on the suggestion management page
- don't select any suggestion and try to delete (check the checkbox and
  submit the form). Verify that you get an alert.
- select 1 suggestion and delete it, verify you get a confirmation
  message
- select 1+ suggestions and delete it, verify you get a confirmation
  message

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>

koha-tmpl/intranet-tmpl/prog/en/modules/suggestion/suggestion.tt

@@ -141,16 +141,16 @@ $(document).ready(function() {
         if ( action_delete_selected ) {
             var suggestions_to_delete = $(this).find("input[name='edit_field']:checked");
             if ( suggestions_to_delete.length == 0 ) {
-                alert(_("No suggestion to delete"));
+                alert(_("Please select at least one suggestion to delete"));
                 e.preventDefault();
                 return false;
             } else if ( suggestions_to_delete.length == 1 ) {
-                if ( ! confirm(_("Are you sure you want to delete this suggestion")) ) {
+                if ( ! confirm(_("Are you sure you want to delete this suggestion?")) ) {
                     e.preventDefault();
                     return false;
                 }
             } else if ( suggestions_to_delete.length > 1 ) {
-                if ( ! confirm(_("Are you sure you want to delete these suggestions")) ) {
+                if ( ! confirm(_("Are you sure you want to delete these suggestions?")) ) {
                     e.preventDefault();
                     return false;
                 }