[Resolved] Snippet trnaslation on product page

Hello,

I am trying to translate custom text on my product page, like here:hidden link

Text is made in code snippets and code looks following :

add_action('woocommerce_product_options_general_product_data', 'add_custom_field_product_delivery');
function add_custom_field_product_delivery() {
echo '<div class="product_custom_field">';
woocommerce_wp_select(
array(
'id' => 'delivery_time',
'label' => __('Delivery Time', 'woocommerce'),
'options' => array(
'0' => __('Nie pokazuj', 'woocommerce'),
'3' => __('3 dni robocze', 'woocommerce'),
'8' => __('8 dni roboczych', 'woocommerce'),
'30' => __('30 dni roboczych', 'woocommerce')
)
)
);
echo '</div>';
}

add_action('woocommerce_process_product_meta', 'save_custom_field_product_delivery');
function save_custom_field_product_delivery($post_id) {
$delivery_time = isset($_POST['delivery_time']) ? $_POST['delivery_time'] : '';
update_post_meta($post_id, 'delivery_time', sanitize_text_field($delivery_time));
}

add_action('woocommerce_before_add_to_cart_form', 'custom_delivery_date_message', 20);
function custom_delivery_date_message() {
date_default_timezone_set('Europe/Warsaw');
$currentDateTime = new DateTime();
$currentDayOfWeek = $currentDateTime->format('N');
$currentHour = $currentDateTime->format('G');
$deliveryDays = get_post_meta(get_the_ID(), 'delivery_time', true);

if ($deliveryDays == 0) {
return; // Jeśli wybrano "Nie pokazuj", nie wyświetlaj komunikatu
}

$deliveryDate = new DateTime();
$deadlineHour = 11;

// Jeśli aktualna godzina jest późniejsza niż godzina graniczna, dodajemy dodatkowy dzień do dostawy
if ($currentHour >= $deadlineHour) {
$deliveryDate->modify('+1 day');
}

for ($i = 0; $i < $deliveryDays; $i++) {
$deliveryDate->modify('+1 day');
// Jeśli to jest weekend, dodajemy dodatkowy dzień
if ($deliveryDate->format('N') >= 6) {
$i--;
}
}

setlocale(LC_TIME, 'pl_PL.utf8');
echo '<div class="custom-delivery-message"><p>🚚 Zamów teraz, a zamówienie wyślemy: <span style="font-weight:800; color:#36b4e4;">' . strftime('%A (%d.%m)', $deliveryDate->getTimestamp()) . '</span></p></div>';
}

What I need to add here to register new strings or maybe is there another way to translate this text.
Many thanks in advance for your support.

Best Regards
Daniel