ajax return json can not use $this->l() function?

[langziyang]

i create module,and i use jquery ajax function in the .tpl file. the ajax code like this:

$("#submit_carrier_number").click(function () {
            var total_shipping = $("input[name='total_shipping']").val();
            var id_order = $("input[name='id_order']").val();
            var carrier_number = $("input[name='carrier_number']").val();
            $.ajax({
                url: baseUri + "modules/freightcollect/updatashipping.php",
                data: "total_shipping=" + total_shipping + "&id_order=" + id_order + "&carrier_number=" + carrier_number,
                dataType: 'json',
                success: function (json) {
                     if (json.succ === true) {
                     location.reload();
                     } else {
                     alert(json.msg);
                     }
                }
            });
        });

and my updateshipping.php code like this:

<?php

require_once(dirname(__FILE__) . '/../../config/config.inc.php');
require_once(dirname(__FILE__) . '/../../init.php');
$module = new FreightCollect();

$valueback = array('succ' => TRUE, 'msg' => $module->l('this is my text'));
echo json_encode($valueback);

when use $module->l() function,the ajax  can not execute location.reload() or alert(json.msg).

 

if the php file change like

$valueback = array('succ' => TRUE, 'msg' => 'this is my text');
echo json_encode($valueback);

all can execute.

 

how can i use it?