MFde: Update the german website.

www/de/Makefile fixes only
www/de/about.sgml 1.11 -> 1.12
www/de/administration.sgml 1.10 -> 1.11
www/de/art.sgml new translation
www/de/developers.sgml 1.173 -> 1.174
www/de/features.sgml 1.21 -> 1.29 + fixes
www/de/internet.sgml fixes only
www/de/share/sgml/navibar.l10n.ent 1.11 -> 1.12 + fixes
www/de/share/sgml/news.xml 1.107 -> 1.109
www/de/share/sgml/press.xml 1.46 -> 1.48

Obtained from: The FreeBSD German Documentation Project