Jenny Erpenbeck has become the first German author to win the International Booker Prize, a prestigious British literary award. “I’m really surprised,” she said as she collected the prize on Tuesday evening in London, adding that she had not even prepared a speech. The 57-year-old from East Berlin won the award for her novel “Kairos,” which tells the love story between a student and an older author in 1980s East Germany. Erpenbeck and her translator Michael Hofmann will split the £50,000 ($63,600) prize. She is widely recognized as one of the most important stars of German literature, and has …