Thanks for the replies.
I'm only using English.
Here are the ot_subtotal.php file contents:
<?php
//
// +----------------------------------------------------------------------+
// |zen-cart Open Source E-commerce |
// +----------------------------------------------------------------------+
// | Copyright (c) 2003 The zen-cart developers |
// | |
// | <http://www.zen-cart.com/index.php> |
// | |
// | Portions Copyright (c) 2003 osCommerce |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the GPL license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available through the world-wide-web at the following url: |
// | <http://www.zen-cart.com/license/2_0.txt>. |
// | If you did not receive a copy of the zen-cart license and are unable |
// | to obtain it through the world-wide-web, please send a note to |
// |
[email protected] so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// $Id: ot_subtotal.php 1969 2005-09-13 06:57:21Z drbyte $
//
define('MODULE_ORDER_TOTAL_SUBTOTAL_TITLE', 'Sub-Total');
define('MODULE_ORDER_TOTAL_SUBTOTAL_DESCRIPTION', 'Order Sub-Total');
?>
Directory list:

Please let me know if you see the problem. Thanks for your help.