Beyoncé has waged war against bosses of arts and craft website Etsy.com over the sale of handmade goods which allegedly infringe her brand. The singer’s attorney has threatened legal action against Etsy bosses over a seller who is offering up mugs emblazoned with a diamond band and the word ‘Feyoncé,’ a play on ‘fiancé’ and a purported reference to Beyoncé’s song Single Ladies.