function gavias_monte_preprocess_page(&$variables) {
  $language = Drupal::languageManager()->getCurrentLanguage()->getId();
  $variables['language'] = $language;
}

function gavias_monte_preprocess_node__lieu__full(&$variables) {
    $language = Drupal::languageManager()->getCurrentLanguage()->getId();
    $variables['language'] = $language;
}