MFbed: Update the German documentation set.

articles/laptop/article.sgml 1.20 -> 1.21
books/faq/book.sgml 1.697 -> 1.701
books/fdp-primer/examples/appendix.sgml new translation [x]
books/handbook/introduction/chapter.sgml fixes only [o]

• Submitted by: Oliver Fischer <plexus at snafu.de>
• Submitted by: Julius Hacker <julius at finalfuture.de>

Obtained from: The FreeBSD German Documentation Project.

Approved by: mheinen (mentor)