If it is a more recent edition of a play (as most Shakespeare plays are, for example), you need to include the bibliographical details for that edition.
You will need:
Author’s Surname, Initials. (Year of translation) Title of the play. Translated by Translator’s Surname, Initials. Place of publication: Publisher.
Chekov, A. (2005) Chekov four plays. Translated by Mulrine, S. London: Nick Hern.
In-text citation: (Chekov, 2005)