Added updates_ja.xml. This file needs to be placed on the autopsy web server next to http://sleuthkit.org/autopsy/updates.xml. This file should be accessible at http://sleuthkit.org/autopsy/updates_ja.xml. This file should be updated anytime that updates.xml is updated. Or any time you want a user running with the JA locale to be notified of a software update.

Updated Bundle_ja.properties to use the updates_ja.xml instead of the updates.xml.
Merge pull request #731 from mrtizmo/update_bubble_ja

Localization of Autopsy auto update notification bubble