Get current language and current route

  $lang = \Drupal::service('language_manager')
      ->getCurrentLanguage()
      ->getId();

    $current_route_name = \Drupal::service('current_route_match')
      ->getRouteName();

    $filter_all_text = t('Todo');
    $filter_all_url = Url::fromRoute($current_route_name);
    $filter_all_url->setOptions([
      'attributes' => [
      'class' => [
        'btn-main-filter',
        ],
      ],
    ]);