By Joshua McElweeVATICAN CITY, April 2 (Reuters) - Pope Leo last May became the first U.S. leader of the global Catholic Church, but for the initial 10 months of his tenure he mostly avoided comment about his home country and never once mentioned President Donald Trump publicly. That era has come to an end.In recent weeks the pope has emerged as a sharp critic of the Iran war. He named Trump, for the first time publicly, on Tuesday in a direct appeal urging the president to end the expanding con...