Email not properly validated

[haavares]

A potential member signed up with a telephone number as email address. This caused problems with the email not being valid at Stripe.

Fix:
Validate email addresses at signup.

[omega]

p2k16/web/src/p2k16/core/account_management.py

Line 172 in 71bb050

def register_account(username: str, email: str, name: str, password: str, phone: str) -> Account:

is the relevant code I guess, that needs to validate email.