If the book you want to use in your assignment has been translated you need to include the translator details in your final reference and the original language, however you do not need to include this in the in-text citation.
Format: in text citation
Montaigne’s philosophical essays have been reinterpreted by a number of different academics (Surname, Year).
Format: reference
Author/editor surname, initials. (Year) Title. Edition. Translated from the [original language] by Surname, initial. Place of publication: Publisher.
Example: in text citation
Montaigne’s philosophical essays have been reinterpreted by a number of different academics (Starobinski, 1986).
Example: reference
Starobinski, J. (1986) Montaigne in Motion. Translated from the French by Goldhammer, A. Chicago: University of Chicago Press.