mbstring check; translation template added

git-svn-id: https://plugins.svn.wordpress.org/affiliate/trunk@911135 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagged 1.1.1.

git-svn-id: https://plugins.svn.wordpress.org/affiliate/trunk@911136 b8457f37-d9ea-0310-8a92-e5e31aec5664