mixed.label does not work in version 0.30.0. "label-string" is replacing the "key-name" in both the "key" and the "error message".

[diegopelusa]

Describe the bug
mixed.label(label: string): Schema overrides not only the key name in the error message, but also the key itself

To Reproduce
Until version 0.30.0, I have this code running properly in a Formik-Form with a Yup-ValidationSchema:

const validationSchema = object({
email: string()
.label(t("email"))
.email(t("email_valid"))
.required(t("field_required"))
});

NOTE: the t("xxx") texts were built with an i18n library

Expected behavior

The expected behaviour was that the error was shown as:
"key-name": "XXXXXXXXXXXXXXX -> text where the key-name is replaced by the label"

Current behavior

In version 0.30.0 the behaviour is:
"label": "XXXXXXXXXXXXXXX -> text where the key-name is replaced by the label"

That makes that the Formik-Form-Field does not recognize that error as the one corresponding to the Field-key.

The validation throws the error correctly, but the key is changed, and therefore the Field does not find the error corresponding to its key.

Platform (please complete the following information):

• Browser: Firefox, Chrome
• Version: 0.30.0