Auth translation in _scaffold

[salvatj]

Need to translate native Auth labels/messages in the _scaffold app (spanish, ...) at least to a minimal start point.
Once that is working, the community could complete the diferent translations.

[salvatj]

In _scaffold/auth/register

Buttons are translated ok:
"Sign Up": {"0": "Registrar"},
"Sign In": {"0": "Identificate"},
"Lost Password": {"0": "Olvide la contraseña"},

but not the field Labels ????
"Username": {"0": "Usuario"},
"Password": {"0": "Contraseña"},
"Password (again)": {"0": "Repetir contraseña"},
"First Name": {"0": "Nombre"},
"Last Name": {"0": "Apellido"},

See capture screen