From mediawiki-l discussion about not viewing robots utf characters http://thread.gmane.org/gmane.org.wikimedia.mediawiki/33601
robots.txt served from wikimedia wikis should have content-type text/plain;charset=utf-8 not just text/plain
robots.txt spec doesn't take content-types into account, no bot should be relying on a specific content-type.
http://www.robotstxt.org/orig.html
Version: unspecified
Severity: minor
URL: http://thread.gmane.org/gmane.org.wikimedia.mediawiki/33601