UPDATE: I managed to get it to reliably not crash. Turn off Rotation Lock, set your device in landscape BEFORE opening the app. Then open it. When the "Visit iOSGods" popup appears, quickly tap one of the options. Immediately switch back to the game AFTER Safari appears but BEFORE the page starts loading. The login page will appear (helpful if you set "remember me" to on) and immediately disappear. Keep tapping the screen to dismiss the successful login popup as soon as possible. Then you're free to change the language to enable the free store.
P.S. @DiDA I managed to get it to work on my setup (iPhone X, iOS 11.1.2, Electra b8-2). Had to remove Liberty (jailbreak anti-detector).