Form submission handler for the 'save' action.
array $form: An associative array containing the structure of the form.
array $form_state: A reference to a keyed array containing the current state of the form.
Overrides EntityFormController::save
public function save(array $form, array &$form_state) {
$this->entity
->save();
drupal_set_message(t('The action has been successfully saved.'));
$form_state['redirect'] = 'admin/config/system/actions';
}