Kdyby\Translation\Translator::domain PHP Метод

    public function domain($messagePrefix)
    {
        return new PrefixedTranslator($messagePrefix, $this);
    }

 protected function createComponentPageForm()
 {
     $form = new Form();
     $form->setTranslator($this->translator->domain('pageEditForm'));
     $form->getElementPrototype()->id = 'page-form';
     $form->addText('title', 'title.label', null, Page::LENGTH_TITLE)->setMaxLength(Page::LENGTH_TITLE)->setRequired('title.messages.required')->setAttribute('data-text-length', Page::LENGTH_TITLE)->addRule(Form::MAX_LENGTH, new Phrase('title.messages.maxLength', ['numChars' => Page::LENGTH_TITLE]), Page::LENGTH_TITLE);
     $form->addText('publishedAt', 'publishedAt.label', null, 16)->setHtmlId('datetimepicker')->setRequired('publishedAt.messages.required')->addCondition(Form::FILLED)->addRule(Form::MAX_LENGTH, new Phrase('publishedAt.messages.maxLength', ['numChars' => 16]), 16);
     $form->addTextArea('intro', 'intro.label', null, 7)->setMaxLength(Page::LENGTH_INTRO)->setRequired('intro.messages.required')->setAttribute('data-text-length', Page::LENGTH_INTRO)->addRule(Form::MAX_LENGTH, new Phrase('intro.messages.maxLength', ['numChars' => Page::LENGTH_INTRO]), Page::LENGTH_INTRO);
     $form->addTextArea('text', 'text.label', null, 25);
     //->setRequired('text.messages.required');
     $form->addText('url', 'url.label', null, 255);
     $form->addSelect('lang', 'lang.label')->setItems($this->availableLocales)->setDefaultValue($this->defaultLocale);
     if (isset($this->page)) {
         $form['lang']->setDisabled();
         //$form['lang']->setOmitted();
     }
     $form->addCheckbox('allowedComments', 'allowedComments.label')->setDefaultValue(true);
     $form->addText('keywords', 'keywords.label');
     $form->addText('description', 'description.label');
     $form->addSubmit('saveAndPublish', 'saveAndPublish.caption')->setAttribute('title', $this->translator->translate('pageEditForm.saveAndPublish.title'))->onClick[] = [$this, 'processPageSavingAndPublishing'];
     $form->addSubmit('saveAsDraft', 'saveAsDraft.caption')->setAttribute('title', $this->translator->translate('pageEditForm.saveAsDraft.title'))->onClick[] = [$this, 'processPageSavingAsDraft'];
     if (!$this->authorizator->isAllowed($this->user, 'page', 'create') or !$this->authorizator->isAllowed($this->user, 'page', 'edit')) {
         $form['saveAndPublish']->setDisabled();
         $form['saveAsDraft']->setDisabled();
     }
     $form->addProtection();
     return $form;
 }