Japanese translation updated by Go MAEDA (#17392, #17003)

git-svn-id: http://svn.redmine.org/redmine@13220 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13219 (#3483).

git-svn-id: http://svn.redmine.org/redmine@13221 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13216, r13217 (#17003).

git-svn-id: http://svn.redmine.org/redmine@13222 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13220 (#17392, #17003).

git-svn-id: http://svn.redmine.org/redmine@13223 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13218 (#16989).

git-svn-id: http://svn.redmine.org/redmine@13224 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13213 (#16530).

git-svn-id: http://svn.redmine.org/redmine@13225 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13213 (#16530).

git-svn-id: http://svn.redmine.org/redmine@13226 e93f8b46-1217-0410-a6f0-8f06a7374b81
Updates for 2.5.2 release.

git-svn-id: http://svn.redmine.org/redmine@13227 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13227 (Updates for 2.5.2 release).

git-svn-id: http://svn.redmine.org/redmine@13228 e93f8b46-1217-0410-a6f0-8f06a7374b81
Updates for 2.4.6 release.

git-svn-id: http://svn.redmine.org/redmine@13229 e93f8b46-1217-0410-a6f0-8f06a7374b81