Well, are you able to get it to compile? You said it doesn't show the message when you accept/refuse a result. This implies that you have the plugin running in your server. However, that means that you have different code in your plugin than you posted.
If you post that "this plugin doesn't work" we can't really help you. You need to tell us what is wrong, specifically. So, if you are able to compile it, I don't see anything wrong with it. But, like I said, the code that you posted will NOT compile because of one of the strings you are providing for the multilingual system. Check the third client_print().