Adjusted how zero values are created for show or use.

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@776802 b8457f37-d9ea-0310-8a92-e5e31aec5664
POT file update

git-svn-id: https://plugins.svn.wordpress.org/mycred/trunk@776803 b8457f37-d9ea-0310-8a92-e5e31aec5664