fix for load_plugin_textdomain() 

git-svn-id: https://plugins.svn.wordpress.org/facebook-shop-by-storeyacom/trunk@978866 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixes for load_plugin_textdomain f-n, new tag 5.4

git-svn-id: https://plugins.svn.wordpress.org/facebook-shop-by-storeyacom/trunk@978896 b8457f37-d9ea-0310-8a92-e5e31aec5664