MFbed: Update the German website.

www/de/Makefile hook up the new "send-pr.sgml"
www/de/includes.sgml fixes only
www/de/includes.xsl fixes only
www/de/includes.navsupport.sgml fixes only
www/de/index.xsl fixes only
www/de/send-pr.sgml new translation
www/de/support.sgml fixes only
www/de/news/news.xml 1.370 -> 1.371

Obtained from: The FreeBSD German Documentation Project.