BERLIN, Aug 26 - When Ulrich Siegmund was studying Business Psychology around a decade ago, he learned a lesson about messaging that has served him well in his quest to become the first member of the far-right AfD party to lead a state government in Germany.The 35-year-old from the eastern state of Saxony-Anhalt has been the sunny, smiling face of the party, which has been polling at around 41% ahead of the September 6 election, giving him a real chance of becoming the state's next premier.Siegmund, who joined the AfD, or Alternative for Germany, in its early phase more than...