MFde: Update the german documentation set.

Thanks to the tireless efforts of Frank Boerner, we were able to
resync many parts of the documentation with the latest version.

articles/version-guide/article.sgml 1.13 -> 1.15 [1]
books/developers-handbook/l10n/chapter.sgml 1.10 -> 1.13 [1]
books/developers-handbook/policies/chapter.sgml 1.33 -> 1.34 [1]
books/developers-handbook/x86/chapter.sgml 1.17 -> 1.18 [1]
books/handbook/disks/chapter.sgml 1.292 -> 1.293 [1]
books/handbook/eresources/chapter.sgml 1.199 -> 1.200
books/handbook/firewalls/chapter.sgml 1.83 -> 1.92 [1]
books/handbook/l10n/chapter.sgml 1.131 -> 1.132 [1]
books/handbook/linuxemu/chapter.sgml 1.139 -> 1.140 [1]
books/handbook/mirrors/chapter.sgml 1.474 -> 1.476 [1]
books/handbook/security/chapter.sgml 1.320 -> 1.336 [1]
books/handbook/virtualization/chapter.sgml 1.22 -> 1.23 [1]
books/porters-handbook/book.sgml 1.1015 -> 1.1016 [1]
share/sgml/mailing-lists.ent 1.68 -> 1.69

[1] Contributed by: Frank Boerner
Obtained from: The FreeBSD German Documentation Project