Update libraries/joomfish/translateparams/xml.php

$this->escape is not allowed in your class since it's static and the function doesn't exist. It generates the following error: Fatal error: Using $this when not in object context in /srv/www/htdocs/joomla16/libraries/joomfish/translateparams/xml.php on line 218. This commit just removes the escape call, if it's needed you need to rewrite it.