German dpkg translation update

Update to 1016t.
Change translation of downgrade messages (Closes: #620312).

debian/changelog

@@ -52,6 +52,9 @@ dpkg (1.16.1) UNRELEASED; urgency=low
   * Add start-stop-daemon process name kernel limits for Solaris, NetBSD,
     OpenBSD, FreeBSD and Darwin.
 
+  [ Updated dpkg translations ]
+  * German (Sven Joachim). Closes: #620312
+
   [ Updated man page translations ]
   * German (Helge Kreutzmann).