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

[laundmo]

I've solved this by using the form style translation snippet I mentioned here: #719 (comment) along an Auth subclass. It changes the MESSAGES variable to a generic translatable string, and I've extracted the English texts to a translation file. Then I set the form style of this Auth subclass to the TranslatedFormStyleFactory(T) which

I've collapsed the code, since its quite long:

Code and en.json translation file

class TranslatedAuth(Auth):
    MESSAGES = {  # noqa: RUF012
        "verify_email": {
            "subject": "auth.verify_email.subject",
            "body": "auth.verify_email.body",
        },
        "reset_password": {
            "subject": "auth.reset_password.subject",
            "body": "auth.reset_password.body",
        },
        "unsubscribe": {
            "subject": "auth.unsubscribe.subject",
            "body": "auth.unsubscribe.body",
        },
        "flash": {
            "user-registered": "auth.unsubscribe.user-registered",
            "password-reset-link-sent": "auth.unsubscribe.password-reset-link-sent",
            "password-changed": "auth.unsubscribe.password-changed",
            "profile-saved": "auth.unsubscribe.profile-saved",
            "user-logout": "auth.unsubscribe.user-logout",
            "email-verified": "auth.unsubscribe.email-verified",
            "link-expired": "auth.unsubscribe.link-expired",
        },
        "labels": {
            "username": "auth.labels.username",
            "email": "auth.labels.email",
            "first_name": "auth.labels.first_name",
            "last_name": "auth.labels.last_name",
            "phone_number": "auth.labels.phone_number",
            "username_or_email": "auth.labels.username_or_email",
            "password": "auth.labels.password",
            "new_password": "auth.labels.new_password",
            "old_password": "auth.labels.old_password",
            "login_password": "auth.labels.login_password",
            "password_again": "auth.labels.password_again",
            "created_on": "auth.labels.created_on",
            "created_by": "auth.labels.created_by",
            "modified on": "auth.labels.modified on",
            "modified by": "auth.labels.modified by",
            "two_factor": "auth.labels.two_factor",
        },
        "buttons": {
            "lost-password": "auth.buttons.lost-password",
            "register": "auth.buttons.register",
            "request": "auth.buttons.request",
            "sign-in": "auth.buttons.sign-in",
            "sign-up": "auth.buttons.sign-up",
            "submit": "auth.buttons.submit",
        },
        "errors": {
            "registration_is_pending": "auth.errors.registration_is_pending",
            "account_is_blocked": "auth.errors.account_is_blocked",
            "account_needs_to_be_approved": "auth.errors.account_needs_to_be_approved",
            "invalid_credentials": "auth.errors.invalid_credentials",
            "invalid_token": "auth.errors.invalid_token",
            "password_doesnt_match": "auth.errors.password_doesnt_match",
            "invalid_current_password": "auth.errors.invalid_current_password",
            "new_password_is_the_same_as_previous_password": (
                "auth.errors.new_password_is_the_same_as_previous_password"
            ),
            "new_password_was_already_used": (
                "auth.errors.new_password_was_already_used"
            ),
            "invalid": "auth.errors.invalid",
            "no_post_payload": "auth.errors.no_post_payload",
            "two_factor": "auth.errors.two_factor",
            "two_factor_max_tries": "auth.errors.two_factor_max_tries",
        },
    }

{
    "auth.verify_email.subject": {
        "0": "Confirm email"
    },
    "auth.verify_email.body": {
        "0": "Welcome {first_name}, click {link} to confirm your email"
    },
    "auth.reset_password.subject": {
        "0": "Password reset"
    },
    "auth.reset_password.body": {
        "0": "Hello {first_name}, click {link} to change password"
    },
    "auth.unsubscribe.subject": {
        "0": "Unsubscribe confirmation"
    },
    "auth.unsubscribe.body": {
        "0": "By {first_name}, you have been erased from our system"
    },
    "auth.flash.user-registered": {
        "0": "User registered"
    },
    "auth.flash.password-reset-link-sent": {
        "0": "Password reset link sent"
    },
    "auth.flash.password-changed": {
        "0": "Password changed"
    },
    "auth.flash.profile-saved": {
        "0": "Profile saved"
    },
    "auth.flash.user-logout": {
        "0": "User logout"
    },
    "auth.flash.email-verified": {
        "0": "Email verified"
    },
    "auth.flash.link-expired": {
        "0": "Link invalid or expired"
    },
    "auth.labels.username": {
        "0": "Username"
    },
    "auth.labels.email": {
        "0": "Email"
    },
    "auth.labels.first_name": {
        "0": "First Name"
    },
    "auth.labels.last_name": {
        "0": "Last Name"
    },
    "auth.labels.phone_number": {
        "0": "Phone Number"
    },
    "auth.labels.username_or_email": {
        "0": "Username or Email"
    },
    "auth.labels.password": {
        "0": "Password"
    },
    "auth.labels.new_password": {
        "0": "New Password"
    },
    "auth.labels.old_password": {
        "0": "Old Password"
    },
    "auth.labels.login_password": {
        "0": "Password"
    },
    "auth.labels.password_again": {
        "0": "Password (again)"
    },
    "auth.labels.created_on": {
        "0": "Created On"
    },
    "auth.labels.created_by": {
        "0": "Created By"
    },
    "auth.labels.modified on": {
        "0": "Modified On"
    },
    "auth.labels.modified by": {
        "0": "Modified By"
    },
    "auth.labels.two_factor": {
        "0": "Authentication Code"
    },
    "auth.buttons.lost-password": {
        "0": "Lost Password"
    },
    "auth.buttons.register": {
        "0": "Register"
    },
    "auth.buttons.request": {
        "0": "Request"
    },
    "auth.buttons.sign-in": {
        "0": "Sign In"
    },
    "auth.buttons.sign-up": {
        "0": "Sign Up"
    },
    "auth.buttons.sign-out": {
        "0": "Sign Out"
    },
    "auth.buttons.submit": {
        "0": "Submit"
    },
    "auth.errors.registration_is_pending": {
        "0": "Registration is pending"
    },
    "auth.errors.account_is_blocked": {
        "0": "Account is blocked"
    },
    "auth.errors.account_needs_to_be_approved": {
        "0": "Account needs to be approved"
    },
    "auth.errors.invalid_credentials": {
        "0": "Invalid Credentials"
    },
    "auth.errors.invalid_token": {
        "0": "invalid token"
    },
    "auth.errors.password_doesnt_match": {
        "0": "Password doesn't match"
    },
    "auth.errors.invalid_current_password": {
        "0": "invalid current password"
    },
    "auth.errors.new_password_is_the_same_as_previous_password": {
        "0": "new password is the same as previous password"
    },
    "auth.errors.new_password_was_already_used": {
        "0": "new password was already used"
    },
    "auth.errors.invalid": {
        "0": "invalid"
    },
    "auth.errors.no_post_payload": {
        "0": "no post payload"
    },
    "auth.errors.two_factor": {
        "0": "Verification code does not match"
    },
    "auth.errors.two_factor_max_tries": {
        "0": "Two factor max tries exceeded"
    }
}