app/index.html (17 lines of code) (raw):
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script>
var hash = (location.hash || '').replace('#', '');
var search = (location.search || '').replace('?', '');
var lang = navigator.language || navigator.userLanguage;
lang = lang.indexOf('zh') > -1 ? 'zh' : 'en';
location.href = './' + lang + '/index.html'
+ (search ? '?' + search : '') + (hash ? '#' + hash : '');
</script>
</head>
<body>
</body>
</html>