I need some more information from you please.
You say that you want to sue the broker for damages of approximately £2000. How has that loss accrued? You say that you will cover the court costs for the customer? Are you saying these losses are the customers losses because if so, it is for the customer to bring those claims or have you refunded the customers and therefore it’s your loss?
Is your concern that because of the racial issue, he is using that against you?
The two issues are completely separate.
If you have suffered loss, you are entitled to sue him to get that loss back.
In respect of this letter, if you sent the letter out then you are culpable along with the translator. However it’s a completely separate issue from suing the broker for your loss. He may agree to let the racial issue drop if you drop any claim against him but that decision is yours.
If you let me know how you have lost the £2000, I can tell you how to proceed with that. If you have any other concerns or questions, I can deal with those for you if you want to ask about any individual points.