The language manager. Type:

public NegotiationBrowserForm::buildForm(array

public NegotiationUrlForm::getFormId()

public LanguageAddForm::form(array $form, FormStateInterface

public LanguageAddForm::actions(array $form, FormStateInterface

The block manager. Type:

public NegotiationSelectedForm::submitForm(array

The entity manager. Type:

public LanguageDeleteForm::logDeletionMessage()

public LanguageDeleteForm::getDescription()