Update index.html

www/login/index.html

@@ -198,19 +198,19 @@
     document.getElementById("origin").value = window.location.search.replace('&error', '');
     var userLang = navigator.language || navigator.userLanguage;
     if (window.location.search.indexOf('error') != -1) {
-        if (userLang == 'cn') {
+        if (userLang == 'zh-CN') {
             document.getElementById('error').innerHTML = '无效的用户名或密码';
         } else {
             document.getElementById('error').innerHTML = 'Invalid username or password';
         }
         document.getElementById('error').style.display = '';
     }
-	if (userLang == 'cn') {
+	if (userLang == 'zh-CN') {
 		document.getElementById('login_header').innerHTML = '登录新空间云控平台';
 	} else {
 		document.getElementById('login_header').innerHTML = 'Please enter user name and password';
 	}
-    if (userLang == 'cn') {
+    if (userLang == 'zh-CN') {
         if (document.getElementById('username').placeholder) {
             document.getElementById('username').placeholder = '用户名';
             document.getElementById('password').placeholder = '密码';