MFbed: Update the German documentation set.

doc/de_DE.ISO8859-1/books/handbook/book.sgml 1.168 -> 1.169
doc/de_DE.ISO8859-1/books/handbook/disks/chapter.sgml 1.268 -> 1.269
doc/de_DE.ISO8859-1/books/handbook/install/chapter.sgml 1.339 -> 1.344
doc/de_DE.ISO8859-1/books/handbook/mirrors/chapter.sgml 1.421 -> 1.422
doc/de_DE.ISO8859-1/books/handbook/security/chapter.sgml 1.308 -> 1.311
doc/de_DE.ISO8859-1/books/handbook/vinum/chapter.sgml new translation [X]
doc/de_DE.ISO8859-1/share/sgml/glossary/freebsd-glossary.sgml 1.24 -> 1.25

Obtained from: The FreeBSD German Documentation Project.

• Contributed by Kay Abendroth (kay.abendroth at raxion dot net)