Thanks, BTW are the strings located in the file I mentioned or did you shift to a cb plugin language file for CBsubs also ?
Because writing the strings in language file did not do anything

There is one thing left not translated on the invoice display for customers, which is payment mode (see attached)

We would like to display the gateway used for payment for customer display. Is this this field ?

How can we translate it or where can we put a field displayed the name of the gateway used ? not generic but the exact gateway name used in the backend so that our mods will now exactly what has been used by simply looking at the invoice on the front end ?

thanks

Please be more specific as to what substitution isn't translating.

Screenshot was attached. Have a look at "Mode de paiement" on the invoice.

There's no substitution for that. Closest available is the gateway type which is PAYMENT_METHOD.

This substitution IS needed.
Buyers would prefer to know on their invoice by which mean the invoice has been paid.
For instance if we use two offline gateways, one named Checks and the other one named Bank Wires, that would allow our mods to know quickly in the backend what needs to be checked by courrier and what needs to be checked on bank account, and that would allow our buyers or one of their staff members to know how the invoice has been paid.

This is a pro requirement as could be a monthly or quarterly paiement of an annual plan (but that's another story )