Translating messages inside the form validate prop no longer works

[MaxAlex666]

Messages inside the global form validation function are now displayed without translation:

const validateUserCreation = (values) => {
    const errors = {};
    if (!values.firstName) {
        errors.firstName = 'The firstName is required';
    }
    if (!values.age) {
        // You can return translation keys
        errors.age = 'ra.validation.required';         // The message is displayed without translation!
    } else if (values.age < 18) {
        // Or an object if the translation messages need parameters
        errors.age = {
            message: 'ra.validation.minValue',       // The message is displayed without translation!
            args: { min: 18 }
        };
    }
    return errors
};

export const UserCreate = () => (
    <Create>
        <Form validate={validateUserCreation}>
            <TextInput label="First Name" source="firstName" />
            <TextInput label="Age" source="age" />
        </Form>
    </Create>
);

React-admin version: 4.8.3
Last version that did not exhibit the issue (if applicable): ~4.8.2
React version: 18.2.0
Browser: Chrome 111.0.5563.65

[djhi]

Please follow the issue template

[fzaninotto]

I believe this is a regression introduced by #8700

[slax57]

You are both right @MaxAlex666 and @fzaninotto
I created a story and added unit tests in #8746 so that we don't run into this issue anymore.
Thanks for the report!