I am parsing the plugin messages, the file in this folder actions: delete.php
has the following code:

if ($success) {
            if ($submit == elgg_echo('delete')) {
                system_message(elgg_echo("messages:deleted"));
            } else {
                system_message(elgg_echo("messages:markedread"));
            }
            // check to see if it is a sent message to be deleted
            if($type == 'sent'){
                forward("pg/messages/sent/?offset={$offset}");
            }else{
                forward("mod/messages/inbox/" . get_loggedin_user()->username . "?offset={$offset}");
            }
        } else {
            register_error(elgg_echo("messages:notfound"));
            forward($_SERVER['HTTP_REFERER']);
        }
?>

I think the parts in bold are incorrect, most do not know how to change the right way, anyone know?

It will be fixed in Elgg 1.7.6.

The first bold part is not incorrect but in the second part it must be "pg" instead of "mod":

http://trac.elgg.org/changeset/7483

Thanks!!!!