MFde: Update the German documentation set.

doc/de_DE.ISO8859-1/books/faq/book.sgml 1.812 -> 1.837 [X]
doc/de_DE.ISO8859-1/books/fdp-primer/sgml-primer/chapter.sgml 1.47 -> 1.48

Obtained from: The FreeBSD German Documentation Project.

• Contributed by: Benedict Reuschling (benedict ett reuschling dott org)