The date format in <lastBuildDate> and <pubDate> contradicts the specification of RSS 2.0.
(e.g. <lastBuildDate>Friday, August 19, 2011</lastBuildDate> and <pubDate>2011/08/18 15:39 CEST</pubDate>.)
Therefore, RSS readers cannot correctly detect the date.
They must follow RFC822.
And, those characters should be English that is not localized.