Well, notice the limitations on that list I linked (e.g., spelling but not
grammar), and no one's promising those all work, that is just a totally
unofficial list of what's on *my* hard drive.
You might want to google this newsgroup or the web re Word 2004 and the
languages that particularly interest you. There was a Spanish custom
dictionary bug that the 11.2 update fixed, I haven't heard of other
language-specific issues.
The trial is limited in certain ways so having only English proofing tools
would make sense. However, all retail versions--Office 2004, Office 2004
Pro, Office 2004 Student/Teacher, and non-retail academic versions--ought to
have all the same languages, far as I know.