change to use printf for some messages

git-svn-id: https://plugins.svn.wordpress.org/tpg-get-posts/trunk@1025370 b8457f37-d9ea-0310-8a92-e5e31aec5664
add .pot in languages folder


git-svn-id: https://plugins.svn.wordpress.org/tpg-get-posts/trunk@1025371 b8457f37-d9ea-0310-8a92-e5e31aec5664