add links to GCP control panel

git-svn-id: https://plugins.svn.wordpress.org/google-cloud-print-library/trunk@1019652 b8457f37-d9ea-0310-8a92-e5e31aec5664
add POT file

git-svn-id: https://plugins.svn.wordpress.org/google-cloud-print-library/trunk@1019654 b8457f37-d9ea-0310-8a92-e5e31aec5664