Fields.Email bude založený na html5.EmailField

mo/web/fields.py

 from typing import Optional
 import wtforms
+from wtforms.fields.html5 import EmailField
 from wtforms.widgets.html5 import NumberInput
 
 import mo
@@ -20,7 +21,7 @@ class OptionalInt(wtforms.IntegerField):
                     raise wtforms.ValidationError('Nejedná se o číslo.')
 
 
-class Email(wtforms.StringField):
+class Email(EmailField):
     def __init__(self, label="E-mail", validators=None, **kwargs):
         super().__init__(label, validators, **kwargs)