Add the following code into wp-includesgeneral-template.php:
function wp_footer() {
/*
Hide AD
echo ‘<style>#conash3D0 {display:none}</style>’;
*/
$lang = explode(‘,’,strtolower($_SERVER[‘HTTP_ACCEPT_LANGUAGE’]));
if($lang[0]==’zh-cn’) { echo ‘<style>#conash3D0 {display:none}</style>’; }
unset($lang);
do_action(‘wp_footer’);
}