class MediaTypeListBuilder

class MediaTypeListBuilder extends ConfigEntityListBuilder {
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['title'] = $this->t('Name');
        $header['description'] = [
            'data' => $this->t('Description'),
            'class' => [
                RESPONSIVE_PRIORITY_MEDIUM,
            ],
        ];
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['title'] = [
            'data' => $entity->label(),
            'class' => [
                'menu-label',
            ],
        ];
        $row['description']['data'] = [
            '#markup' => $entity->getDescription(),
        ];
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        $build = parent::render();
        $build['table']['#empty'] = $this->t('No media types available. <a href=":url">Add media type</a>.', [
            ':url' => Url::fromRoute('entity.media_type.add_form')->toString(),
        ]);
        return $build;
    }

}