Update POT and Japanese translation.

git-svn-id: https://plugins.svn.wordpress.org/bogo/trunk@961857 b8457f37-d9ea-0310-8a92-e5e31aec5664
Ready for 2.3 release.

git-svn-id: https://plugins.svn.wordpress.org/bogo/trunk@961858 b8457f37-d9ea-0310-8a92-e5e31aec5664