License: Acknowledgement language

Josef Spillner <[email protected]>
Newsgroups gmane.comp.xfree86.forum
Message-ID <[email protected]> 
Condition 3:
...must include the following acknowledgment: "This product includes software 
developed by The XFree86 Project, Inc (http://www.xfree86.org/) and its 
contributors".

So non-English documentation must carry an English acknowledgement?
Or is any valid translation thereof covered by the license as well?
Please clarify.

Josef
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