The Illinois Human Rights Commission earlier this month ruled in favor of a transgender high school student who claimed his school district discriminated against him by mandating that he dress behind a curtain in the boys’ locker room.The decision marks the first time the Human Rights Commission has interpreted the state Human Rights Act to cover transgender students as having total access to school facilities, said Ed Yohnka, director of communications for the American Civil Liberties Union of Illinois. ACLU attorneys …