I've had the same problem. Opening it in a completely new personal window and logging in to Whatsapp Web stays in English. Accomplishing this in a normal Edge browser windows logs me in Using the German language. My browser options are established to English United kingdom, as is my technique, https://register-i8-live29629.bloginwi.com/69788465/live-casino-games-things-to-know-before-you-buy