A city official has asked Geno's, one of Philadelphia's best-known cheesesteak joints, to take down a sign......"This is America: When ordering, speak English." Councilman Jim Kenney noted some residents of linguistically diverse South Philadelphia find the sign offensive. .....Geno's owner, Joseph Vento, a grandson of Sicilian immigrants....(said) "I don't see much of a big deal about learning to say, 'Cheez Whiz.' "