Update with 正體中文 (Chinese traditional), thx Mike Hsiao

includes/locale.php

@@ -33,7 +33,11 @@ if (empty($_SESSION['locale']) && strlen($_SERVER['HTTP_ACCEPT_LANGUAGE']) >= 2)
         $locale = "nl_NL.UTF-8";
         break;
     case "zh":
-        $locale = "zh_CN.UTF-8";
+        if ($_SERVER['HTTP_ACCEPT_LANGUAGE'] == 'zh_TW') {
+            $locale = "zh_TW.UTF-8";
+        } else {
+            $locale = "zh_CN.UTF-8";
+        }
         break;
     case "cs":
         $locale = "cs_CZ.UTF-8";

includes/system.php

@@ -107,6 +107,7 @@ function DisplaySystem()
     $arrLocales = array(
         'en_GB.UTF-8' => 'English',
         'cs_CZ.UTF-8' => 'Čeština',
+        'zh_TW.UTF-8' => '正體中文 (Chinese traditional)',
         'zh_CN.UTF-8' => '简体中文 (Chinese simplified)',
         'da_DK.UTF-8' => 'Dansk',
         'de_DE.UTF-8' => 'Deutsch',