Watertown High School students will soon be able to have the Seal of Biliteracy on their diplomas and transcripts. Students in the Watertown Public Schools speak 59 languages, Kate Phillipson, director of English as a Second Language Coordinator told the School Committee Monday night. Some learn a language in school, others speak a language other than English at home, and still more take language classes outside of school. “The State Seal of Biliteracy is a nationally and state recognized seal that recognizes graduates that speak, listen, read, and write proficiently in more than one language,” said Adam Silverberg, the district’s World Language Coordinator. The seal will be placed on diplomas and transcripts, Silverberg said, and students could be recognized during graduation.