@ShaunBurch it doesn't sound like this is discriminating based on someone's language.
Rather, this is based on the person receiving additional value, at a cost to the supplier, regardless of what languages they may or may not be able to speak.
If it costs more to supply the service the choices are to pass that cost over to everyone or to charge extra to the one who receives extra value from the additional service.
It has nothing to do with the someone's language since the other factors are the same regardless.