Although I am not a native speaker of German I believe I know the
basics of the language and AFAIK it should be "außerordentliche"
indeed. I've fixed the typo on the Foundation's wiki:
http://wikimediafoundation.org/w/index.php?diff=51795&oldid=50557
Best regards,
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[[user:odder]] | Tomasz W. Kozłowski