Translate Cart and Checkout

Hello,
I’d need some help with this because I’ve trying for weeks.
I am trying to translate wooccommerce into 2 languages. I’ve managed to translate the shop and the products, but the checkout and cart are still in the original language (English).
I am using this plugin: Woocommerce Polylang Integration, but it seems not to be working.
I added this code to my functions.php, but doesn’t work:

function get_woocommerce_cart_polylang()
{
    return pll_get_post(get_option('woocommerce_cart_page_id' ) );
}
add_filter('woocommerce_cart_shop_page_id', "get_woocommerce_cart_polylang");

function get_woocommerce_shop_polylang()
{
    return pll_get_post(get_option('woocommerce_shop_page_id' ) );
}
add_filter('woocommerce_get_shop_page_id', "get_woocommerce_shop_polylang");

function get_woocommerce_checkout_polylang()
{
    return pll_get_post(get_option('woocommerce_checkout_page_id' ) );
}
add_filter('woocommerce_checkout_page_id', "get_woocommerce_checkout_polylang");

Can anyone point me in the right direction?
I must use a free plugin.

Thank you