change in the newstweet-ajax.php the next part:
$url = 'http://search.twitter.com/search.json?q='.urlencode($_POST['searchterm']).'&rpp=3&lang=en';
and change it for this:
$url = 'http://search.twitter.com/search.json?q='.urlencode($_POST['searchterm']).'&rpp=3&lang=all';
I used in http://www.malaletra.com