Remove help-tabs.php.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7/trunk@1031120 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update POT and Japanese translation.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-7/trunk@1031122 b8457f37-d9ea-0310-8a92-e5e31aec5664