Change approach to training "username" #13
Description
The current "credential" that is used to log into the training is based on a base70 syllable representation of the integer ID, plus an auth code.
As the number of trainings increase, this credential will become longer and eventually too long for young children to type/remember.
In the future we probably want to integrate with existing school authentication systems, but an interrim solution could be to extend the letter-based credential with symbols, e.g. pick the two fruits beloning to your account + enter the (shorter) credential:
[banana] [apple] boge milapo