Controller for language addition forms. Hierarchy class \Drupal\Core\Form\

public static NegotiationConfigureForm

public static LanguageFormBase::create(ContainerInterface

public LanguageAddForm::validateCustom(array $form, FormStateInterface

The configurable language manager. Type:

The block storage. Type: \Drupal\Core\Entity\EntityStorageInterface|null File

public static NegotiationUrlForm::create(ContainerInterface

public ContentLanguageSettingsForm

public NegotiationConfigureForm::buildForm(array

Base form for language add and edit forms. Hierarchy class \Drupal\Core\Form\