Looking a bit closer through the other linked topic it also seems to show up in English, so language settings are unlikely to help. The weird thing is that your shop seems to be missing some tabs, it should actually looks like this:
No “Gems”, no “Subscriptions”, and, most importantly, no “Warbands” tab in your shop, so Luther probably gets stuck trying to move you there. Beats me what could cause those tabs to go missing. Apparently reinstalling doesn’t help, so it’s possibly something server side in your account profile. Open a support ticket, maybe they can at least disable the tutorial for you so you can play again.