correct language mistakes in readme.txt and added FAQ's

git-svn-id: https://plugins.svn.wordpress.org/the-casengo-chat-widget/trunk@969592 b8457f37-d9ea-0310-8a92-e5e31aec5664
updated FAQ HTML corrections

git-svn-id: https://plugins.svn.wordpress.org/the-casengo-chat-widget/trunk@969594 b8457f37-d9ea-0310-8a92-e5e31aec5664