Merged r12339 from trunk to 2.4-stable (#15524)

Japanese translation updated by Go MAEDA.

--HG--
branch : 2.4-stable
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/branches/2.4-stable%4012341
Merged r12340 from trunk to 2.4-stable.

use escaping html in wiki_syntax_detailed.html.

--HG--
branch : 2.4-stable
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/branches/2.4-stable%4012342