MFde: Update the German website.
www/de/developers.sgml 1.211 -> 1.213
www/de/docs/books.sgml fixes only
www/de/platforms/ppc.sgml 1.21 -> 1.22
www/de/projects/projects.sgml fixes only
www/de/share/sgml/news.xml 1.225 -> 1.228
Obtained from: The FreeBSD German Documentation Project.