People around the world—including Russians in dozens of cities and world leaders at a conference in Germany—paid tribute Sunday to Alexei Navalny. The Russian opposition leader’s death at age 47, while detained in a penal colony, was announced Friday. The government detained some of the mourners, the AP reports. The global reaction included: Russia: People took flowers and candles to ad hoc memorials and monuments to victims of political repression over the weekend. By Sunday evening, a rights group reported, more than 300 of them had been detained. In St. Petersburg, Grigory Mikhnov-Voitenko,…