[Tails-l10n] [de](review) Some unfuzzing

Hi,

please review the commits from

66656342c8a (de) (de) Unfuzz about.de.po.

up to

95480bd8da1 (de) Unfuzz download.de.po

in http://git.tails.boum.org/frithjof/tails/ doc/unfuzz.

These should be easy to review as most of the changes are straightforward.

One commit contains some noise from re-wrapping an otherwise unchanged
paragraph. Sorry! Does somebody know how I can re-wrap a single msgstr
in emacs without affecting the rest of the .po file?

Cheers,
Frithjof