Index: wp-includes/script-loader.php
===================================================================
--- wp-includes/script-loader.php	(revision 6691)
+++ wp-includes/script-loader.php	(working copy)
@@ -166,6 +166,11 @@
 				'confirmText' => __("Are you sure you want to delete the file '%title%'?\nClick ok to delete or cancel to go back.")
 			) );
 			$this->add( 'admin-widgets', '/wp-admin/js/widgets.js', array( 'interface' ), '20080109' );
+			$this->localize( 'admin-widgets', 'widgetsL10n', array(
+				'add' => __('Add'),
+				'edit' => __('Edit'),
+				'cancel' => __('Cancel'),
+			));
 		}
 	}