synced changes with CORE

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer-cloud/trunk@856066 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme updates and RO translation

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer-cloud/trunk@856933 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixing undefined function error

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer-cloud/trunk@857991 b8457f37-d9ea-0310-8a92-e5e31aec5664