German translation update

debian/changelog

@@ -11,6 +11,8 @@ apt (0.7.25) UNRELEASED; urgency=low
     Closes: #479997
   * Polish translation update by Wiktor Wandachowicz
     Closes: #548571
+  * German translation update by Holger Wansing
+    Closes: #551534
   
   [ Michael Vogt ]
   * apt-pkg/packagemanager.cc: