[html-formfu] I18N translations

[Carl Franks]

I've updated HTML::FormFu::I18N::en so it has entries for all current
constraints, inflators, validators and transformers.

If anyone is able to help complete the I18N files for the other
current languages, it would be much appreciated.
They are:

    de
    es
    ja
    pt_pt

And, of course, if anyone wants to provide I18N for any other
language, please do!

Cheers,
Carl