Hello,
You asked us about the following sentence “Checkout is not available whilst your cart is empty. ” and this is WooCommerce plugin text and we don’t see any problem with the translation/changing of this text using translation files https://prnt.sc/os2qzt Check the frontend. If you remove the translation you’ll get the previous text.
If you ask about the 404 page content – this is our theme content.
Also, we would be grateful if you won’t mix the questions. Don’t create a situation when we or WooCommerce blames each other if you ask different questions. It’s our reputation we don’t want to make WooCommerce support think that we just want to avoid responsibility!
Regards