La función register_post_type y los "labels"

plugin-cpt.php

<?php
/*
Plugin Name:  Plugin CPT y Custom Taxonomies
Plugin URI:   https://silicodevalley.com
Description:  Plugin para aprender a crear CPT y CT con código
Version:      1.0.0
Author:       David Perálvarez
Author URI:   https://silicodevalley.com
License:      GPL2
License URI:  https://www.gnu.org/licenses/gpl-2.0.html
*/

/*
Plugin CPT y Custom Taxonomies is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
any later version.

Plugin CPT y Custom Taxonomies is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Plugin CPT y Custom Taxonomies. If not, see https://www.gnu.org/licenses/gpl-2.0.html.
*/

// Comic Reviews
function comic_review_setup_post_type(){

  $labels = array(
    'name' => __( 'Reseñas', 'scv' ),
    'singular_name' => __( 'Reseña', 'scv' ),
    'add_new' => __( 'Añadir reseña', 'scv' ),
    'add_new_item' => __( 'Añadir nueva reseña', 'scv' ),
    'edit_item' => __( 'Editar reseña', 'scv' ),
    'new_item' => __( 'Nueva reseña', 'scv' ),
    'view_item' => __( 'Ver reseña', 'scv' ),
    'view_items' => __( 'Ver reseñas', 'scv' ),
    'search_items' => __( 'Buscar reseñas', 'scv' ),
    'not_found' => __( 'No se encontraron reseñas', 'scv' ),
    'not_found_in_trash' => __( 'Ninguna reseña encontrada en la papelera', 'scv' ),
    //'parent_item_colon'
    'all_items' => __( 'Todas las reseñas', 'scv' ),
    //'archives'
    //'atributes'
    'insert_into_item' => __( 'Insertar en la reseña', 'scv' ),
    //'uploaded_to_this_item'
    //'featured_image'
    //'set_featured_image'
    //'remove_featured_image'
    //'use_featured_image'
    //'menu_name' => __( 'Reseñas de cómics', 'scv' ),
    'filter_items_list' => __( 'Lista de reseñas filtrada', 'scv' ),
    'items_list_navigation' => __( 'Navegación por el listado de reseñas', 'scv' ),
    'items_list' => __( 'Lista de reseñas', 'scv' ),
    //'name_admin_bar'
  );

  $args = array(
    'public' => true,
    'labels' => $labels,
  );

  // poner prefijo, max 20
  register_post_type( 'scv_comic_review', $args );
}

add_action( 'init', 'comic_review_setup_post_type' );