Issue #3255434 by SV: Use label instead of machine name of content type in the...

      $date = _social_event_format_date($node, NULL);

    }

    /** @var \Drupal\node\NodeTypeInterface $node_type */

    $node_type = $this->entityTypeManager

      ->getStorage('node_type')

      ->load($node->bundle());

    // Prepare the preview.

    $preview_info = [

      '#theme' => 'message_content_preview',

      '#author_name' => $node->getOwner()->getDisplayName(),

      '#date' => $date,

      '#title' => $node->getTitle(),

      '#type' => strtoupper($node->getType()),

      '#type' => mb_strtoupper((string) $node_type->label()),

      '#link' => $link,

    ];