Japanese translation updates.
Japanese translation updates.

* subversion/po/ja.po: Make some improvements and terminological
  unifications.
  Now ja.po has 1671 translated messages against r27227 (Emacs PO-mode
  status: "1671t+594o").

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion