MFde: Update the german website.

www/de/developers.sgml 1.176 -> 1.178
www/de/index.xsl 1.160 -> 1.161
www/de/where.sgml 1.90 -> 1.91
www/de/docs/books.sgml 1.28 -> 1.29
www/de/ports/Makefile 1.48 -> 1.49
www/de/share/sgml/news.xml 1.112 -> 1.122
www/de/share/sgml/press.xml 1.52 -> 1.54

Obtained from: The FreeBSD German Documentation Project