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http://commons.wikimedia.org/wiki/MediaWiki:Sitestatstext uses
  {{NUMBEROFMEDIAFILES|,}}
to display the number of files.  The first parameter, a comma, is the thousands
separator in the resulting number.  Although it displays fine in the MediaWiki
page, at
  http://commons.wikimedia.org/wiki/Special:Statistics
it displays as "189{{{1}}}382".

Can you use the template like that outside of Special:Statistics?

Good question.  It works fine at
http://commons.wikimedia.org/wiki/User:Dbenbenn/sandbox

Do any template paramaters work at all on Special:Statistics?

{{NUMBEROFFILES}} has worked for some time now (even in
[[vi:MediaWiki:Sitestatstext]]), thanks to Bug 4324.

Marking FIXED.