Mostrar sub-taxonomia en Wordpress: Ayuda Urgente

// Registrar tipo de elemento Frases
function frases() {
	$labels = array(
		'name'                => __( 'Frases', 'jg' ),
		'singular_name'       => __( 'Frases', 'jg' ),
		'menu_name'           => __( 'Frases %%PENDING_COUNT%%', 'jg' ),
		'name_admin_bar'      => __( 'Frases', 'jg' ),
		'all_items'           => __( 'Frases', 'jg' ),
		'parent_item' => __( 'Frases' ),
	);
	$rewrite = array(
		'slug'                => 'frases',
		'with_front'          => true,
		'pages'               => true,
		'feeds'               => true,
	);
	$args = array(
		'label'               => __( 'Frases', 'jg' ),
		'description'         => __( 'Frases manage', 'jg' ),
		'labels'              => $labels,
		'supports'            => array( 'editor' ),
		'taxonomies'          => array( 'frases' ),
		'search_items'        => array( 'Buscar frases' ),
		'hierarchical'        => false,
		'public'              => true,
		'show_ui'             => true,
		'show_in_menu'        => true,
		'menu_position'       => 5,
		'menu_icon'           => 'dashicons-editor-quote',
		'show_in_admin_bar'   => true,
		'show_in_nav_menus'   => false,
		'can_export'          => true,
		'has_archive'         => true,
		'exclude_from_search' => false,
		'publicly_queryable'  => true,
		'rewrite'             => $rewrite,
		'capability_type'     => 'page',
	);
	register_post_type( 'frases', $args );
}
add_action( 'init', 'frases', 0 );

// Pendientes

add_action('auth_redirect', 'add_pending_count_filter');
add_action('admin_menu', 'esc_attr_restore');
function add_pending_count_filter() {
  add_filter('attribute_escape', 'remove_esc_attr_and_count', 20, 2);
}
function esc_attr_restore() {
  remove_filter('attribute_escape', 'remove_esc_attr_and_count', 20, 2);
}
function remove_esc_attr_and_count( $safe_text = '', $text = '' ) {
  if ( substr_count($text, '%%PENDING_COUNT%%') ) {
    $text = trim( str_replace('%%PENDING_COUNT%%', '', $text) );
    remove_filter('attribute_escape', 'remove_esc_attr_and_count', 20, 2);
    $safe_text = esc_attr($text);
    $count = (int)wp_count_posts( 'frases',  'readable' )->pending;
    if ( $count > 0 ) {
      $text = esc_attr($text) . '<span class="awaiting-mod count-' . $count . '" style="margin-left:7px;"><span class="pending-count">' . $count . '</span></span>';
      return $text;
    } 
  }
  return $safe_text;
}

function frases_taxonomy() {
	register_taxonomy('frases', array('frases'),

		array(
			'show_admin_column' => true, 
			'hierarchical'		=> true,
			'label'				=> __('Categoria','mtms'),
			'rewrite'			=> array( 'slug' => 'frases'),
		));
}
add_action('init', 'frases_taxonomy', 0);
	function jg_c() {
		flush_rewrite_rules();
	}
add_action( 'after_switch_theme', 'jg_c' );