var myLoader:URLLoader = new URLLoader();
myLoader.load(new URLRequest("yourfile.xml"));

// myLoader = all your xml data

var language = *button clicked*;

switch (language){

case "English":
 trace.myLoader(english[content]);
break;

case "Arabic":
// trace.myLoader(arabic.content);
break;

case "Spanish":
// trace.myLoader(spanish.content);
break;

}