In this community center turned polling place, Juan Sanchis stands near an electronic ballot reader with a smile on his face, waiting. Many of the voters filing into the Willston Community Center, in a diverse pocket of Fairfax County, don’t speak English very well. When it seems like the voters don’t understand, Sanchis switches over to Korean or Spanish, or gets a worker who speaks Vietnamese. Around him on the tables and walls, pamphlets and signs are translated into all three of those languages. “If they need help understanding, that’s what I try to do,” Sanchis said earlier this month, as Virginia primary voters went to the polls to choose candidates for a variety of state and local offices. As the country grows more diverse, more local governments like Fairfax County, a Washington, D.C., suburb, are falling under a federal election law that requires them to provide language assistance — including translators and translated election materials — to certain minority groups that are heavily represented in their communities. Dozens of communities were added to the list for the first time in December, sending local officials in those communities scrambling.