add_filter('woocommerce_catalog_orderby', 'wc_customize_product_sorting');
function wc_customize_product_sorting($sorting_options){
$sorting_options = array(
'menu_order' => __( 'Sorting', 'woocommerce' ),
'popularity' => __( 'Sort by popularity', 'woocommerce' ),
'rating' => __( 'Sort by average rating', 'woocommerce' ),
'date' => __( 'Sort by newness', 'woocommerce' ),
'price' => __( 'Sort by price: low to high', 'woocommerce' ),
'price-desc' => __( 'Sort by price: high to low', 'woocommerce' ),
);
return $sorting_options;
}