Replace the link to the german homepage of heise online with the english one.
This guide does not talk much about the well-known insecurities of trusting a
public-key infrastructure (PKI)\footnote{Interested readers are referred to
\url{https://bugzilla.mozilla.org/show_bug.cgi?id=647959} or
-\url{http://www.heise.de/security/meldung/Der-ehrliche-Achmed-bittet-um-Vertrauen-1231083.html}
-(german) which brings the problem of trusting PKIs right to the point}. Nor
+\url{http://www.h-online.com/security/news/item/Honest-Achmed-asks-for-trust-1231314.html}
+which brings the problem of trusting PKIs right to the point}. Nor
does this text fully explain how to run your own Certificate Authority (CA).