corrected grammar

git-svn-id: https://plugins.svn.wordpress.org/starbox/trunk@936090 b8457f37-d9ea-0310-8a92-e5e31aec5664
corrected grammar

git-svn-id: https://plugins.svn.wordpress.org/starbox/trunk@936091 b8457f37-d9ea-0310-8a92-e5e31aec5664