Update POT and Japanese translation.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7/trunk@1031601 b8457f37-d9ea-0310-8a92-e5e31aec5664
Set sidebar in set_help_tabs().

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7/trunk@1031608 b8457f37-d9ea-0310-8a92-e5e31aec5664