The theme of next year's Met Gala has been unveiled as John Galliano: Horizons, a tribute to the scandalous and pioneering fashion designer. Galliano, 65, catapulted to stardom as a dazzling 1990s wunderkind at Givenchy and Dior, championed by Vogue editor Anna Wintour, who also runs the Met Gala. His career imploded after a December 2010 video captured him hurling drunken antisemitic slurs at two women, declaring 'I love Hitler' and adding that their 'forefathers would be f***ing gassed.' He was gradually able to navigate a return to the spotlight after his longtime close friend Kate Moss enlisted him to design her wedding dress. A…