fix validate zero

git-svn-id: https://plugins.svn.wordpress.org/si-contact-form/trunk@791056 b8457f37-d9ea-0310-8a92-e5e31aec5664
ip_address data send

git-svn-id: https://plugins.svn.wordpress.org/si-contact-form/trunk@791299 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated German

git-svn-id: https://plugins.svn.wordpress.org/si-contact-form/trunk@791317 b8457f37-d9ea-0310-8a92-e5e31aec5664
upload version 4.0.16

git-svn-id: https://plugins.svn.wordpress.org/si-contact-form/trunk@793894 b8457f37-d9ea-0310-8a92-e5e31aec5664
update pot

git-svn-id: https://plugins.svn.wordpress.org/si-contact-form/trunk@793895 b8457f37-d9ea-0310-8a92-e5e31aec5664