Update Polish dpkg translation

Closes: #680561

debian/changelog

@@ -2,6 +2,7 @@ dpkg (1.16.8) UNRELEASED; urgency=low
 
   [ Updated programs translations ]
   * French (Christian Perrier).
+  * Polish (Michał Kułach). Closes: #680561
   * Russian (Yuri Kozlov). Closes: #677850, #680411
   * Slovak (Ivan Masár).
   * Spanish (Javier Fernández-Sanguino)