WooCommerce - Change the product loop add to cart button text

functions.php

<?php
function custom_woocommerce_product_add_to_cart_text( $text ) {
	return __( 'Novo texto do botão' );
}

add_filter( 'woocommerce_product_add_to_cart_text', 'custom_woocommerce_product_add_to_cart_text' );