$mform->addElement('textarea', '{{ id }}', get_string('{{ id }}', '{{ langCategory }}'), array('rows' => 6, 'cols' => 40));
        //$mform->setType('{{ id }}', PARAM_RAW);
        //$mform->setDefault('{{ id }}', 'defult string value for the textarea');
{% include 'form/form-common-element.twig' %}