MFbed: Update the German website.

www/de/index.xsl fixes only
www/de/community/mailinglists.sgml fixes only [X]
www/de/news/news.sgml 1.47 -> 1.48
www/de/security/security.sgml 1.192 -> 1.193
www/de/share/sgml/libcommon.xsl fixes only
www/de/share/sgml/news.xml 1.45 -> 1.49
www/de/share/sgml/press.xml 1.25 -> 1.28

Obtained from: The FreeBSD German Documentation Project.

• Found by Markus Stalder (universe at truemetal dot org)