Unfortunately the app and all the online material are only available in English, but you can play the game anywhere in the world where there are portals. I play in Berlin, Germany and we have more than a thousand portals and more than 600 players here.
So if you are able to understand the English app and online material, you can play it in any country. In Berlin we also have a very active Google+ community in which we speak German. So even if you are not fluent in English, you should be able to play the game, if you know the few terms you find in the game.