Update Readme with languages

git-svn-id: https://plugins.svn.wordpress.org/twitter-widget-with-styling/trunk@811564 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update pot file

git-svn-id: https://plugins.svn.wordpress.org/twitter-widget-with-styling/trunk@811567 b8457f37-d9ea-0310-8a92-e5e31aec5664