MFbed: Update the German documentation set.

books/faq/book.sgml 1.780 -> 1.781
books/handbook/Makefile 1.98 -> 1.100
books/handbook/book.sgml 1.164 -> 1.166
books/handbook/chapters.ent 1.33 -> 1.35
books/handbook/firewalls/chapter.sgml 1.66 -> 1.67
books/handbook/mirrors/chapter.sgml 1.416 -> 1.418
books/handbook/network-servers/chapter.sgml 1.79 -> 1.81
books/handbook/preface/preface.sgml 1.30 -> 1.32
flyer/Makefile 1.1 -> 1.2
flyer/flyer.tex 1.10 -> 1.13

Obtained from: The FreeBSD German Documentation Project.