How to translate Phoenix default error message when `email_input` from a form is empty?

When I remove the required: :true option, I don’t get the can't be blank message that @sfusato mentionend; hence why I decided to write some small javascript.

That might be the reason why also the title property does not work?

Also this form is not used to create a user, it is mostly for login so it has nothing to do with Ecto (who, as far as I know, usually displays those error this field can't be blank type of message).