Update Japanese man page translation

Closes: #704240

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

debian/changelog

@@ -151,6 +151,7 @@ dpkg (1.17.0) UNRELEASED; urgency=low
     Thanks to Christian Perrier <bubulle@debian.org>. Closes: #712976
   * Fix typo in dpkg-source(1) man page French translation.
     Thanks to Cédric Boutillier <boutil@debian.org>. Closes: #708292
+  * Japanese (TAKAHASHI Motonobu). Closes: #704240
 
  -- Guillem Jover <guillem@debian.org>  Fri, 03 Aug 2012 13:21:00 +0200