Japanese translation (email notification) updated by Go MAEDA (#16536)

git-svn-id: http://svn.redmine.org/redmine/trunk@13060 e93f8b46-1217-0410-a6f0-8f06a7374b81
fix typos at unit version test

git-svn-id: http://svn.redmine.org/redmine/trunk@13061 e93f8b46-1217-0410-a6f0-8f06a7374b81
fix typos of source comments at Version model

git-svn-id: http://svn.redmine.org/redmine/trunk@13062 e93f8b46-1217-0410-a6f0-8f06a7374b81