[html-formfu] Required and Email constraint doesn't give error message

[kewei xiao]

Hi Carl

    the "Required" constraint and "Email" constraint used to give me 
"the field is required"  or "This is not an email address" error 
message.  After I updated my HTML-FormFu it only gives me

"form_error_message".

    I am not sure if there has been any changes to these contraints.  Thanks

Ke Wei