[Tails-l10n] [Merge](de) wiki translation for gpgapplet

Hi,

please merge branch gpgapplet-xlat

37170cf (de) wiki translation gpgapplet: improved language
0a02bd0 (de) wiki translation gpgapplet: use terms from translated UI
elements
d6872be (de) wiki translation gpgapplet: fixed link to wikipedia
b8cd3f9 (de) wiki translation for encryption_and_privacy/gpgapplet continued
056fb41 (de) applied poedit-changed *.po file headers
bcfea79 (de) wiki translation for encryption_and_privacy/gpgapplet

in flapflap/tailsxlat.git

cheers,
~flapflap