New language added and readme fix

git-svn-id: https://plugins.svn.wordpress.org/tabbed-login/trunk@869334 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme.txt change

git-svn-id: https://plugins.svn.wordpress.org/tabbed-login/trunk@869340 b8457f37-d9ea-0310-8a92-e5e31aec5664