Form submission handler.
array $form: An associative array containing the structure of the form.
array $form_state: An associative array containing the current state of the form.
Overrides FormInterface::submitForm
public function submitForm(array &$form, array &$form_state) {
$this->configFactory
->get('locale.config.' . $this->language->langcode . '.system.date')
->delete();
$form_state['redirect'] = 'admin/config/regional/date-time/locale';
}