BUDAPEST, Hungary — The often vicious media machine built by Hungary’s longtime leader Viktor Orbán has taken a small step toward accepting that elections in April had swept away the old system. Its flagship newspaper promised to stop calling the incoming prime minister, Peter Magyar, a “bug” who must be “exterminated.” “In the future, we will refrain from calling you a bug or showing you as an insect in any context,” Magyar Nemzet, a pugnacious print and internet outlet, said in a contrite letter to Magyar, who took over as Hungary’s prime minister Saturday. The letter was sent on orders from a Hungarian court, so it was hardly a spontaneous peace offering, but its sincerity is sure to be tested by Magyar’s ascent. The incoming prime minister has insisted that his sweeping election victory on April 12 should bring about not only a change of government in Hungary, but a “complete regime change” after 16 years of rule by Orbán’s defeated Fidesz party.…