Convert Japanese translations from ISO-2022-JP to UTF-8

since "Support for Additional Languages" needs to be enabled
in the installation of JRE to read ISO-2022-JP.

Reviewed by: kawai

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@663964 13f79535-47bb-0310-9956-ffa450edef68