DOCBOOK: Printing "Module" instead of "Chapter".

We have a document which is a booklet. We are using the book type but
we'd like to replace the word "Chapter" with "Module" (and, of course,
it's correspondent in portuguese). Is there a booklet type or an easy
way to change the word "Chapter" for "Module" in the stylesheet? I'd
like to have all the chapter characteristics but change it's name. 

Thanks,
--
Godoy.	<>               GPG Fingerprint
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"Ser poeta não é minha ambição,          E932 1330 BE6D A4A3 0625 
 é minha maneira de estar sozinho"
              - Fernando Pessoa.       Publicações @ Conectiva S.A. 

Except where explicitly stated I speak on my own behalf.
Exceto onde explicitado as declarações aqui feitas são apenas minhas.