Duolingo — recently selected by Apple as its iPhone App of the Year — has updated to version 3.1.1. The intuitive free language learning app now lets users practice all skills and strengthen skills at any time. A new Language Coach feature keeps users dedicated and on track. Also, Duolingo has added Lingots, a new virtual currency that can be traded in for extras. Like everything else in the app, Lingots are free. Google has updated its Google…
