ZAGREB, Croatia (AP) — It was one of the biggest nights in Croatia's sporting calendar: a European Championship soccer qualifying match with Italy. Seconds after kick-off in a game beamed around the world, a gigantic swastika materialized on the pitch under the shocked gaze of European soccer officials. The swastika, sprayed by an unknown vandal with a chemical that became visible only when floodlights went on to start the game, has become the most potent symbol of a rise in ultra-nationalist sentiment that appears to be bleeding into the mainstream population in the European Union's newest member state. But it's...