fix comment form redirection

git-svn-id: https://plugins.svn.wordpress.org/polylang/trunk@869506 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix regex

git-svn-id: https://plugins.svn.wordpress.org/polylang/trunk@869510 b8457f37-d9ea-0310-8a92-e5e31aec5664