1) We would generally use "which" here. Which refers to a thing or an idea, and to also ask about choices. In this case it is in reference to the translation. When "who" is the object of a verb, "whom" can be used instead, but it is formal and rather old-fashioned!
2) Whose refers to ownership and is used in casual conversation for sure, for example: "Whose bag is this?" "There's the student whose asked a question about who, whom and whose!"