Thousands of Germans have staged protests against the far-right Alternative für Deutschland (AfD) after the party’s watershed victory in a state election, warning it posed a danger in two more polls this month.Demonstrators at Berlin’s Brandenburg Gate held a peaceful pro-democracy rally denouncing the anti-immigrant, pro-Russian AfD, which has called for mass deportations of asylum seekers and a rollback of state support for renewable energy and public broadcasting.The party captured its best-ever state result in the former communist eastern state of Saxony-Anhalt on Sunday, with clear momentum heading into regional elections in the capital and Mecklenburg-Western Pomerania, on the Baltic...