Update gamemanager.php

lang/English/modules/gamemanager.php

@@ -203,4 +203,5 @@ define('admin', "Admin");
 define('cid', "CID");
 define('phan', "Phantom");
 define('sec', "Seconds");
-?>
+define('unknown_rsync_mirror', "You attempted to start an update from a mirror which doesn't exist.");
+?>