Email invoice received by client

In the email invoice received by client there is an entry which says "Payment Method" and then the price. This is not a payment method - it is the payment fee. I can change the language file to fix this but it seems though it should be payment method and this is the incorrect way of doing this.

The invoice needs to show "Payment Fee" and there is also the entry on the invoice "Shipping Method". Again, I can change this in the language file but it might be used somewhere else which does require it be shipping method where on the invoice it should just say Shipping.