Purpose
=======
Clean up messages related to email verification.
Specification
=============
Rephrase messages, add confirmation of email sent and let user change
email.
Do not show "Validation Email sent" if the current user changed their
email address.
PR: https://github.com/odoo/odoo/pull/77617
Task-2647065
closesodoo/odoo#77617
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
