#1467 Try to clean up abstract message file handler hierarchy

- Move some handling with the default file configuration down to the help message file handler since it is the only one with such a behavior now

src/main/java/fr/xephi/authme/message/MessagesFileHandler.java

@@ -10,9 +10,6 @@ import javax.inject.Inject;
  */
 public class MessagesFileHandler extends AbstractMessageFileHandler {
 
-    // TODO #1467: With the migration the messages handler has become so different that it would be worth
-    // to remove the extension and extract common features into a helper class instead
-
     @Inject
     private MessageUpdater messageUpdater;
 
@@ -43,9 +40,4 @@ public class MessagesFileHandler extends AbstractMessageFileHandler {
     protected String createFilePath(String language) {
         return "messages/messages_" + language + ".yml";
     }
-
-    @Override
-    protected String getUpdateCommand() {
-        return "/authme messages";
-    }
 }