Is it possible to change the required validation message to something friendlier?

[Matt Raible]

I would like to change the validation messages to be a bit more 
friendly, like they are with Commons Validation and Struts/Spring. 
Basically, instead of:

"firstName": Value is required.
I'd like it to say "First Name is a required field."
I have the following in my resource bundle, but it doesn't give me 
access to the field's label (i18n-ized).

javax.faces.component.UIInput.REQUIRED={0} is a required field.
Instead it prints:
firstName is a required field.
Any idea how to look up a input field's label and use the text from that 
in the {0}?

Thanks,
Matt