MFde: Update the German website.

www/de/administration.sgml 1.19 -> 1.21
www/de/developers.sgml 1.203 -> 1.204
www/de/where.sgml fixes only
www/de/platforms/amd64.sgml 1.22 -> 1.23
www/de/share/sgml/news.xml 1.192 -> 1.193

Obtained from: The FreeBSD German Documentation Project