WWO said:

Where does an Order Master go to change their Order's language?

i.e. As seem in the List of Orders list:

e.g.

I've now asked support this.

They refuse to make such changes.

Despite advising them I have decades of development experience, and can follow any depth of technical complexity, they would not provide any specific reason as to why they would not manually change one particular word in one particular record of the orders database.