Translation problem (to Chinese Simplified)

<?php

// Simplified Chinese (UTF-8) was Translated by CoolHD
// Any suggestion just feel free to mail me.
// coolhd.tw@yahoo.com.tw
// Determine what locale to use
switch (PHP_OS)
{
    case 'WINNT':
    case 'WIN32':
        $locale = 'chinese-simplified';
        break;

    case 'FreeBSD':
    case 'NetBSD':
    case 'OpenBSD':
        $locale = 'zh_CN.UTF-8';
        break;

    default:
        $locale = 'zh_CN';
        break;
}

// Attempt to set the locale
setlocale(LC_CTYPE, $locale);


// Language definitions for frequently used strings
$lang_common = array(

// Text orientation and encoding
'lang_direction'        =>    'ltr',    // ltr (Left-To-Right) or rtl (Right-To-Left)
'lang_identifier'        =>    'chinese',
'lang_encoding'            =>    'UTF-8',
'lang_multibyte'        =>    true,