Make "user other case" translatable

(cherry picked from commit ed5498e)

src/main/java/fr/xephi/authme/listener/AuthMePlayerListener.java

@@ -243,9 +243,8 @@ public class AuthMePlayerListener implements Listener {
             String realName = auth.getRealName();
             if (!realName.isEmpty() && !realName.equals("Player") && !realName.equals(event.getName())) {
                 event.setLoginResult(AsyncPlayerPreLoginEvent.Result.KICK_OTHER);
-                // TODO: Add a message like : MessageKey.INVALID_NAME_CASE
-                event.setKickMessage("You should join using username: " + ChatColor.AQUA + realName +
-                    ChatColor.RESET + "\nnot: " + ChatColor.RED + event.getName());
+                event.setKickMessage(
+                    plugin.getMessages().retrieveSingle(MessageKey.INVALID_NAME_CASE, realName, event.getName()));
                 return;
             }
             if (realName.isEmpty() || realName.equals("Player")) {

src/main/java/fr/xephi/authme/output/MessageKey.java

@@ -127,7 +127,9 @@ public enum MessageKey {
 
     TWO_FACTOR_CREATE("two_factor_create", "%code", "%url"),
 
-    NOT_OWNER_ERROR("not_owner_error");
+    NOT_OWNER_ERROR("not_owner_error"),
+    
+    INVALID_NAME_CASE("invalid_name_case", "%valid", "%invalid");
 
     private String key;
     private String[] tags;