translation and internationalization

git-svn-id: https://plugins.svn.wordpress.org/pricemesh/trunk@1027326 b8457f37-d9ea-0310-8a92-e5e31aec5664
adding language files

git-svn-id: https://plugins.svn.wordpress.org/pricemesh/trunk@1027327 b8457f37-d9ea-0310-8a92-e5e31aec5664
removed typos in readme

git-svn-id: https://plugins.svn.wordpress.org/pricemesh/trunk@1027334 b8457f37-d9ea-0310-8a92-e5e31aec5664