%s not showing the corrisponding order number in the email

-- url of the page with the problem -- : www.mangialarossa.com/
-- HikaShop version -- : 3.2.1
-- Joomla version -- : 3.7.5
-- PHP version -- : 7.0
-- Browser(s) name and version -- : firefox

Hi
In the email received by the client after placing the order (ORDER_CREATION_NOTIFICATION_SUBJECT), it is shown "Do not forget to include the order number %s in the comments of the bank transfer so that we can match it to your order. "
How to replace %s with the corresponding order number?

Here it is the string in the HTML version for the email ORDER_CREATION_NOTIFICATION_SUBJECT:
{TXT:INCLUDE_ORDER_NUMBER_TO_TRANSFER}

Here it is the string in the English language file:
INCLUDE_ORDER_NUMBER_TO_TRANSFER="Do not forget to include the order number ( %s ) in the comments of the bank transfer so that we can match it to your order."

What should I change?

Thanks