We're aware of an issue when restoring the app to a new iPhone or iPad from an iCloud backup that causes the error message "Oops, something went wrong" to appear when opening any lesson.
Our engineers will resolve this in a future update.
If you are affected by this issue please uninstall the Babbel App from the device by long pressing on the app and selecting "Remove App. Then, reinstall the Babbel app from the Apple App store. After logging in, the issue will be resolved.