German dpkg translation update

Update to 984t.

debian/changelog

@@ -56,6 +56,7 @@ dpkg (1.15.8) UNRELEASED; urgency=low
     Martin Pitt, thanks! Closes: #68788, #68861, #497304, #525567, #583902
 
   [ Updated programs translations ]
+  * German (Sven Joachim).
   * Russian (Yuri Kozlov). Closes: #579149
   * Swedish (Peter Krefting).