Check delete_site and delete_sites caps. Check for delete_user is more places.

git-svn-id: https://develop.svn.wordpress.org/trunk@16329 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/network/sites.php

@@ -54,6 +54,8 @@ if ( isset( $_REQUEST['updated'] ) && $_REQUEST['updated'] == 'true' && ! empty(
 		break;
 		case 'delete':
 			$msg = __( 'Site deleted.' );
+		case 'not_deleted':
+			$msg = __( 'You do not have permission to delete that site.' );
 		break;
 		case 'archive':
 			$msg = __( 'Site archived.' );