The subway system serving the nation’s capital had a different look and feel yesterday, featuring fare signs and announcements in Spanish to assist with an influx of illegal-immigrant supporters who were lobbying lawmakers on Capitol Hill.Throughout the day, audible announcements that are piped through Metro’s system came through in both English and Spanish. At station entrances, Spanish-language signs explained the cost of a ride. Metro also boosted the presence of Spanish-speaking employees at stations.The efforts came in response to the April 10 protests in Washington, which drew tens of thousands of illegal immigrants to the National Mall. Operators of the...