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

public LanguageAddForm::validateCustom(array $form, FormStateInterface

public static LanguageFormBase::create(ContainerInterface

Configure the selected language negotiation method for this site. Hierarchy class

public static NegotiationUrlForm::create(ContainerInterface

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

The configurable language manager. Type:

public LanguageDeleteForm::getFormId()

public ContentLanguageSettingsForm

public NegotiationConfigureForm::get