changes for version 4.2.3

git-svn-id: https://plugins.svn.wordpress.org/clean-and-simple-contact-form-by-meg-nicholas/trunk@794965 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated pot file

git-svn-id: https://plugins.svn.wordpress.org/clean-and-simple-contact-form-by-meg-nicholas/trunk@794977 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated stable tag to 4.2.3

git-svn-id: https://plugins.svn.wordpress.org/clean-and-simple-contact-form-by-meg-nicholas/trunk@795024 b8457f37-d9ea-0310-8a92-e5e31aec5664