Banu Mushtaq’s book “ Heart Lamp ” last week became the first story collection to win the International Booker Prize.... It was also the first work translated from Kannada, a southern Indian language, to receive the award. But “ Heart Lamp ” is unusual for another reason.... Mushtaq’s oeuvre of more than 60 stories written over three decades and first published in Kannada-language journals. The collaboration that won the two women the world’s most prestigious award for fiction translated into