initFormLangcodes example

  /** * Initializes the form state and the entity before the first form build. * * @param \Drupal\Core\Form\FormStateInterface $form_state * The current state of the form. */
  protected function init(FormStateInterface $form_state) {
    // Ensure we act on the translation object corresponding to the current form     // language.     $this->initFormLangcodes($form_state);
    $langcode = $this->getFormLangcode($form_state);
    $this->entity = $this->entity->hasTranslation($langcode) ? $this->entity->getTranslation($langcode) : $this->entity->addTranslation($langcode);

    $form_display = EntityFormDisplay::collectRenderDisplay($this->entity, $this->getOperation());
    $this->setFormDisplay($form_display, $form_state);

    parent::init($form_state);
  }

  /** * Initializes form language code values. * * @param \Drupal\Core\Form\FormStateInterface $form_state * The current state of the form. */