Jarves\Configuration\Field::setRequired PHP Method

    public function setRequired($required)
    {
        $this->required = $required;
    }

 /**
  * Makes sure $this->_fields has a language field when multiLanguage=true
  */
 protected function ensureLanguageField()
 {
     if ($this->getMultiLanguage() && !isset($this->_fields['lang'])) {
         $langField = new Field(null, $this->jarves);
         $langField->setId('lang');
         $langField->setType('text');
         $langField->setRequired(true);
         $this->_fields['lang'] = $langField;
     }
 }