Is this the form you are talking about?
I'm trying to understand what you mean by set the fields to be russian. Do you mean the actual form fields like such?
<form><input type="text" name="name" placeholder="Your name" /><input type="text" name="email" placeholder="email@example.com" /><input type="submit" value="Submit" /></form>
You should be able to keep the names in English, and their values should be submitted correctly. The names should really just be keys and they won't have an effect on the actual submitted data.
I hope I understood the problem correctly.