Index: src/wp-admin/comment.php
===================================================================
--- src/wp-admin/comment.php	(revision 39166)
+++ src/wp-admin/comment.php	(working copy)
@@ -326,7 +326,7 @@
 	exit();
 
 default:
-	wp_die( __('Unknown action.') );
+	wp_die( __('Invalid action.') );
 
 } // end switch
 
Index: src/wp-includes/widgets/class-wp-widget-rss.php
===================================================================
--- src/wp-includes/widgets/class-wp-widget-rss.php	(revision 39166)
+++ src/wp-includes/widgets/class-wp-widget-rss.php	(working copy)
@@ -71,7 +71,7 @@
 		}
 
 		if ( empty($title) )
-			$title = empty($desc) ? __('Unknown Feed') : $desc;
+			$title = empty($desc) ? __('Invalid Feed') : $desc;
 
 		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
 		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

 
 	if ( $errors->get_error_code() )
 		return $errors;