public function listColumns($columns)
    {
        $columns = array(
            'cb'     => '<input type="checkbox">',
            'title'  => __('Page', 'customer-feedback'),
            'id'     => __('ID', 'customer-feedback'),
            'answer' => __('Answer', 'customer-feedback'),
            'hasComment'   => __('Has comment', 'customer-feedback'),
            'topic' => __('Topic', 'customer-feedback'),
            'date'   => __('Date')
        );

        return $columns;
    }