Comment modifier et ajouter un nouveau rôle utilisateur sur WordPress ?

/**
 *  USER - User role
 *  - Add a new user role.
 */
add_action('init', '_pit_add_user_role');
function _pit_add_user_role() {

    /** Our user role data */
    $new_role_label = 'Étudiant';
    $new_role_slug = sanitize_title($new_role_label); // etudiant
    $new_role_capabilities = array();

    /**
     *  Give "author" capabilities to the new user role (example)
     *  @example
     */
    if (empty($new_role_capabilities)) {
        $author = get_role('author');
        $new_role_capabilities = $author->capabilities;
    }

    /** Create the new user role */
    add_role($new_role_slug, $new_role_label, $new_role_capabilities);
}