Hook update to change all content to French in Drupal 8

my_module.install

/**
 * Enable language module, delete english and set french as default.
 */
function my_module_update_N() {
  \Drupal::service('module_installer')->install(['language']);

  // Enable french language and set it as default.
  if (NULL === ConfigurableLanguage::load('fr')) {
    ConfigurableLanguage::create([
      'id' => 'fr',
      'label' => 'French',
      'direction' => 'ltr',
      'weight' => 0,
    ])->save();
  }
  \Drupal::configFactory()->getEditable('system.site')->set('default_langcode', 'fr')->save();

  // Convert all english entity data to french.
  $fsconfigs = FieldStorageConfig::loadMultiple();
  $entityTypes = [];
  $database = \Drupal::database();
  $entityTypeManager = \Drupal::entityTypeManager();
  foreach ($fsconfigs as $fsconfig) {
    /** @var FieldStorageConfig $fsconfig */
    // Ensure fsconfig is translatable, has data and uses the default storage
    // (database).
    if ($fsconfig->isTranslatable() && $fsconfig->hasData() && !$fsconfig->hasCustomStorage()) {
      // Load and save target EntityType for further handling.
      $targetEntityTypeId = $fsconfig->getTargetEntityTypeId();
      if (!array_key_exists($targetEntityTypeId, $entityTypes)) {
        $entityTypes[$targetEntityTypeId] = $entityTypeManager->getDefinition($targetEntityTypeId);
      }

      // Change langcode in all field tables.
      if (empty($entityTypes[$targetEntityTypeId]) || !$entityTypes[$targetEntityTypeId]->isTranslatable()) {
        continue;
      }
      $tables = [
        $entityTypes[$targetEntityTypeId]->getBaseTable() . '__' . $fsconfig->getName(),
      ];
      if ($entityTypes[$targetEntityTypeId]->isRevisionable()) {
        $tables[] = $entityTypes[$targetEntityTypeId]->getRevisionTable() . '__' . $fsconfig->getName();
      }
      foreach ($tables as $table) {
        $database->update($table)
          ->fields(['langcode' => 'fr'])
          ->condition('langcode', 'en')
          ->execute();
      }
    }
  }

  // Convert all english content entities to french.
  foreach ($entityTypes as $entityType) {
    if (!$entityType->isTranslatable()) {
      continue;
    }
    /** @var \Drupal\Core\Entity\EntityType $entityType */
    $tables = [
      $entityType->getBaseTable(),
      $entityType->getDataTable(),
    ];
    if ($entityType->isRevisionable()) {
      $tables[] = $entityType->getRevisionTable();
      $tables[] = $entityType->getRevisionDataTable();
    }
    foreach ($tables as $table) {
      $database->update($table)
        ->fields(['langcode' => 'fr'])
        ->condition('langcode', 'en')
        ->execute();
    }
  }

  // Delete english language.
  ConfigurableLanguage::load('en')->delete();
}