Small textual change

git-svn-id: https://plugins.svn.wordpress.org/timeline-twitter-feed/trunk@1049264 b8457f37-d9ea-0310-8a92-e5e31aec5664
and again

git-svn-id: https://plugins.svn.wordpress.org/timeline-twitter-feed/trunk@1049267 b8457f37-d9ea-0310-8a92-e5e31aec5664