If you speak English then I would not bring an interpreter. You really should hire an attorney to at the very least prepare you and attend the interview. They likely will only seperate you and your wife if you do not convince them at the first interview. If your relationship is genuine then you should have provided or should provide evidence of that.
Andre Olivie, Esq.
Legal disclaimer: This answer is offered for informational purposes only. It is not offered as, and does not constitute, legal advice. Do not rely on this advice without speaking to an immigration attorney in detail about your case. This message does not create an attorney-client relationship.
The best thing you can do for yourself at this point is to get a lawyer so she/he can prepare you and go with you to the interview. It's hard and impossible to conuslt you on the interview issues on this forum.
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You must get immigration attorney. As to interpreter depends on office but most places provide thier own at government expense.
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