[[MediaWiki:wikilog-item-brief-header|]]
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The message wikilog-item-brief-header seems to need PLURAL support on parameter $5 (authors) which can be one or many as it appears. It it is one, GENDER support was also needed.
Thanks. I'll fix this issue soon. You may track it here: http://code.google.com/p/mediawiki-wikilog/issues/detail?id=1&can=1