New account grappe bug password

[Mikoteko]

In login.tag, we check if the password contains 6 letters to tell the user about it, but we don't check if it matches the password 's regex pattern in _pattern.js or not.

Which means that the user has no idea that he can't create an account because of a password that doesn't match the password's regex pattern

The regex pattern used to check if the mail is correct is in the code instead of being taken from the _pattern.js file.

[simonLouvet]

regex matching is done (.match) but not based on a common constant