Japanese wiki_syntax_detailed.html translation updated by Go MAEDA (#18252)

git-svn-id: http://svn.redmine.org/redmine@13531 e93f8b46-1217-0410-a6f0-8f06a7374b81
Merged r13531 from trunk to 2.6-stable (#18252)

Japanese wiki_syntax_detailed.html translation updated by Go MAEDA.

git-svn-id: http://svn.redmine.org/redmine@13532 e93f8b46-1217-0410-a6f0-8f06a7374b81