Localized DoubleLoginFix

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

@@ -4,6 +4,10 @@ package fr.xephi.authme.message;
  * Keys for translatable messages managed by {@link Messages}.
  */
 public enum MessageKey {
+    /**
+     * You have been disconnected due to doubled login.
+     */
+    DOUBLE_LOGIN_FIX("double_login_fix.fix_message"),
 
     /**
      * You are stuck in portal during Login.

src/main/java/fr/xephi/authme/message/updater/MessageUpdater.java

@@ -152,6 +152,7 @@ public class MessageUpdater {
             .put("gui_captcha", "3rd party features: GUI Captcha")
             .put("bedrock_auto_login", "3rd party features: Bedrock Auto Login")
             .put("login_location_fix", "3rd party features: Login Location Fix")
+            .put("double_login_fix", "3rd party features: Double Login Fix")
             .build();
 
         Set<String> addedKeys = new HashSet<>();