YANG YUANQING, Lenovo’s boss, hardly spoke a word of English until he was about 40: he grew up in rural poverty and read engineering at university. But when Lenovo bought IBM’s personal-computer division in 2005 he decided to immerse himself in English: he moved his family to North Carolina, hired a language tutor and -- the ultimate sacrifice -- spent hours watching cable-TV news. Lenovo is one of a growing number of multinationals from the non-Anglophone world that have made English their official language. The fashion began in places with small populations but global ambitions su