Order Printer app translations

[KimiSi]

The new Order Printer app allows you to translate texts. For example, address texts can be translated: {{ "customer_accounts.order_details.shipping.address" | t }}, but texts such as "quantity" {{ "customer.order.quantity" | t }}, "total" {{ "cart.label.total" | t }} gives us a "Translation missing:" error. I'd rather use existing translations than create more lines. We are using Impulse theme. 

Do I have a typo somewhere or is there something limiting the use of translations?