po: Update Simplified Chinese translation

Closes: #770280
Signed-off-by: Guillem Jover <guillem@debian.org>

debian/changelog

@@ -3,7 +3,7 @@ dpkg (1.17.22) UNRELEASED; urgency=low
   [ Updated programs translations ]
   * German (Sven Joachim).
   * French (Sébastien Poher).
-  * Simplified Chinese (Zhou Mo). Closes: #766724
+  * Simplified Chinese (Zhou Mo). Closes: #766724, #770280
   * Swedish (Peter Krefting).
   * Vietnamese (Trần Ngọc Quân)