Add label to the checkbox on right side

Since we have the "Remove" label on the left side checkbox, it may be useful to have an "Add" label on the right side checkbox. Sorry, the most recent commit is included in this diff as well.

--- entityreference_view_widget.a/entityreference_view_widget.module      2011-10-07 11:49:33.000000000 -0400
+++ entityreference_view_widget.b/entityreference_view_widget.module     2011-10-17 02:54:20.000000000 -0400
@@ -330,10 +330,12 @@
   // displayed through the view.
   $substitutions = array();
   foreach ($view->result as $key => $result) {
-    $entity_id = reset($result);
+    //$entity_id = reset($result);
+    $entity_id = $result->{$view->base_field};
     $element['add'][$entity_id] = array(
       '#type' => 'checkbox',
       '#refresh_items' => TRUE,
+      '#title' => t('Add'),
       '#ajax' => array(
         'path' => 'entityreference_view_widget/ajax/' . $field_name,
         'wrapper' => 'edit-' . str_replace('_', '-', $field_name),