Change storefront featured product section title

storefront-featured-title.php

add_filter( 'storefront_featured_products_args', 'custom_storefront_product_featured_title');

// Frontpage Featured Products Title
function custom_storefront_product_featured_title( $args ) {
    $args['title'] = __( 'New Featured Products Title Here', 'storefront' );
    return $args;  
}