(Reuters) – Hackers replaced a “Book of the Dead” with neo-Nazi slogans and symbols on World War Two concentration camp Buchenwald’s website (www.buchenwald.de) on Wednesday and completely erased the Mittelbau Dora camp website.”Brown is beautiful,” read one slogan in English, referring to the color of the uniform shirts of Adolf Hitler’s SA stormtroopers. “We’ll be back,” threatened another in German.