Remove "second devices" possibly added by unwanted party

Perhaps it would make sense to rename this feature to “Add Additional Device” to raise awareness that it can be misused. Many users may believe that DC only allows two devices.

The new name would clarify that the profile can run on any number of devices simultaneously, making it especially important to securely archive backups and to be particularly vigilant with DC-Desktop in public places.

Furthermore, it’s obviously also a great feature that most messengers don’t have. A name change would emphasize this.