The good news is that Chautauqua Theater Company is staging Anton Chekhov’s 1901 “Three Sisters,” one of the greatest plays ever written, through July 17. Further, good reports can be made of the chosen translation: by the late Slavic academic-turned-actor Paul Schmidt, it renders Chekhov’s then-contemporary idiom (the play is set in a stultifying provincial city in 1900) into plausible, listenable and unstilted American English, with only a few questionable decisions.