MFbed: Update the German documentation set.
doc/de_DE.ISO8859-1/books/handbook/Makefile fixes only
doc/de_DE.ISO8859-1/books/handbook/book.sgml 1.170 -> 1.171
doc/de_DE.ISO8859-1/books/handbook/chapters.ent 1.36 -> 1.37
doc/de_DE.ISO8859-1/books/handbook/basics/chapter.sgml 1.146 -> 1.147
doc/de_DE.ISO8859-1/books/handbook/config/chapter.sgml 1.225 -> 1.226
doc/de_DE.ISO8859-1/books/handbook/install/chapter.sgml 1.346 -> 1.347
doc/de_DE.ISO8859-1/books/handbook/jails/chapter.sgml fixes only
doc/de_DE.ISO8859-1/books/handbook/l10n/chapter.sgml 1.122 -> 1.123
doc/de_DE.ISO8859-1/books/handbook/mirrors/chapter.sgml 1.431 -> 1.432
doc/de_DE.ISO8859-1/books/handbook/preface/preface.sgml 1.35 -> 1.39
doc/de_DE.ISO8859-1/books/handbook/virtualization/chapter.sgml new chapter
Obtained from: The FreeBSD German Documentation Project.