Clean-up of form buttons at registration form.
Correcting typo in form field validation.
Correcting validation message for form field, and setting type to "email".
Correcting typo.
Addding a new validator named "Validator\FilterVar". You can pass in values from the "filter_var" function, along with any options. To validate email addresses, the filter "FILTER_VALIDATE_EMAIL" is now used, instead of regex.
Modifying type hint.
Merge pull request #1782 from shefik/user_registration_form

Clean-up User Registration Form