Added plugin language files for Slovak language.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-to-email/trunk@1046286 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added plugin language files for Swedish language.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-to-email/trunk@1046307 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added info about Swedish language.

git-svn-id: https://plugins.svn.wordpress.org/contact-form-to-email/trunk@1046329 b8457f37-d9ea-0310-8a92-e5e31aec5664