Fast-food giant KFC has apologized to its German customers after it used the anniversary of the event that instigated the Holocaust to promote its chicken. Users of the chicken chain’s German app received a push notification on Wednesday that read: “It’s memorial day for Kristallnacht! Treat yourself with more tender cheese on your crispy chicken. Now at KFCheese!” Around an hour later, KFC sent a second alert to app users, according to German newspapers. “We are very sorry, we will check our internal processes immediately so that this does not happen again,” the company said via push notification. “Please excuse...