Ojs\CoreBundle\Form\Type\JournalBasedTranslationsType::configureOptions PHP Method

    public function configureOptions(OptionsResolver $resolver)
    {
        $journal = $this->journalService->getSelectedJournal(false);
        if (!$journal instanceof Journal) {
            return;
        }
        $journalLocaleBag = $journal->getLocaleCodeBag();
        if (!in_array($journal->getMandatoryLang()->getCode(), $journalLocaleBag)) {
            $journalLocaleBag[] = $journal->getMandatoryLang()->getCode();
        }
        $resolver->setDefaults(array('locales' => $journalLocaleBag, 'default_locale' => $journal->getMandatoryLang()->getCode(), 'required_locales' => [$journal->getMandatoryLang()->getCode()]));
    }