public ContentEntityFormInterface::getFormLangcode(FormStateInterface $form_state)
Gets the code identifying the active form language.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
string The form language code.
public function getFormLangcode(FormStateInterface $form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!ContentEntityFormInterface.php/function/ContentEntityFormInterface::getFormLangcode/8.1.x