Symptoms
We are using the placeholder @@Payment_PaymentMethod_PaymentSystem@
in the invoice notification template. An invoice is generated correctly in the accounts language, but the payment system name is in English, even though the localized name exists.
Cause
The reason is a bug with id #PBA-57797 ("The placeholder @@Payment_PaymentMethod_PaymentSystem@ cannot be localized").
Resolution
The bug is fixed in PBA 5.5.7, install the latest PBA updates.