Textfield group has incorrect validation message for e-mail validation #50
Description
If you flag a textfield as being of type email then the message that is shown if the entered data is not a valid e-mail address is incorrect.
Currently it shows "This is a invalid email address" and the correct english would be "This is an invalid email address".
This also highlights a further issue with the validation message in that there is no possibility to show the messages in another language. The component should use i18n messages for all output.