  
  
  class EmailField(CharField):
      default_error_messages = {
          'invalid': _("Enter a valid email address.")
      }
  
      def __init__(self, **kwargs):
          super(EmailField, self).__init__(**kwargs)
          validator = EmailValidator(message=self.error_messages['invalid'])
 
</s> remove         'invalid': _("`{input}` is not a valid boolean.")
 </s> add         'invalid': _('`{input}` is not a valid boolean.') </s> remove         'invalid': _("`{input}` is not a valid boolean.")
 </s> add         'invalid': _('`{input}` is not a valid boolean.') </s> remove         'does_not_exist': _("Object with {slug_name}={value} does not exist."),
        'invalid': _("Invalid value."),
 </s> add         'does_not_exist': _('Object with {slug_name}={value} does not exist.'),
        'invalid': _('Invalid value.'), </s> remove         'invalid': _("Invalid data. Expected a dictionary, but got {datatype}.")
 </s> add         'invalid': _('Invalid data. Expected a dictionary, but got {datatype}.') </s> remove         'not_a_list': _("Expected a list of items but got type `{input_type}`.")
 </s> add         'not_a_list': _('Expected a list of items but got type `{input_type}`.')
        'invalid': _('Enter a valid email address.')
  
  
  class EmailField(CharField):
      default_error_messages = {
        'invalid': _('Enter a valid email address.')
      }
  
      def __init__(self, **kwargs):
          super(EmailField, self).__init__(**kwargs)
          validator = EmailValidator(message=self.error_messages['invalid'])
keep keep keep keep replace keep keep keep keep keep
 prefer single quotes in source and double quotes in user visible strings; add some missing full stops to user visible strings 
rest_framework/fields.py