/**
 * Implements hook_entity_extra_field_info().
 */
function {{ machine_name }}_entity_extra_field_info() {
  $extra = [];
  $module_language_enabled = \Drupal::moduleHandler()->moduleExists('language');
  $description = t('Node module element');

  foreach (NodeType::loadMultiple() as $bundle) {

    // Add also the 'language' select if Language module is enabled and the
    // bundle has multilingual support.
    // Visibility of the ordering of the language selector is the same as on the
    // node/add form.
    if ($module_language_enabled) {
      $configuration = ContentLanguageSettings::loadByEntityTypeBundle('node', $bundle->id());
      if ($configuration->isLanguageAlterable()) {
        $extra['node'][$bundle->id()]['form']['language'] = [
          'label' => t('Language'),
          'description' => $description,
          'weight' => 0,
        ];
      }
    }
    $extra['node'][$bundle->id()]['display']['language'] = [
      'label' => t('Language'),
      'description' => $description,
      'weight' => 0,
      'visible' => FALSE,
    ];
  }

  return $extra;
}