to translate returned messages

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@1030114 b8457f37-d9ea-0310-8a92-e5e31aec5664
changes of text

git-svn-id: https://plugins.svn.wordpress.org/wp-fastest-cache/trunk@1030115 b8457f37-d9ea-0310-8a92-e5e31aec5664