You should upgrade to see if that fixes this.
30 seconds seems like a long time to install a language pack. This might be a xenForo problem. But you can try addressing the 30 second timeout as well by asking your host to increase PHP's max_execution_time.
You can also try changing the max_execution_time yourself. These methods don't always work, but try adding this to your
library/config.php file:
Code:
ini_set('max_execution_time', 120);
Or add this to a
.htaccess file on your server (only works on Apache servers):
Code:
php_value max_execution_time 120