refactor all class to use the message key for sending messages.

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

@@ -39,6 +39,10 @@ public enum MessageKey {
 
     REGISTER_EMAIL_MESSAGE("reg_email_msg"),
 
+    MAX_REGISTER_EXCEEDED("max_reg"),
+
+    USAGE_REGISTER("usage_reg"),
+
     USAGE_UNREGISTER("usage_unreg"),
 
     PASSWORD_CHANGED_SUCCESS("pwd_changed"),
@@ -57,7 +61,7 @@ public enum MessageKey {
 
     ALREADY_LOGGED_IN_ERROR("logged_in"),
 
-    LOGOUT_SUCCESS("logout_success"),
+    LOGOUT_SUCCESS("logout"),
 
     USERNAME_ALREADY_ONLINE_ERROR("same_nick"),
 

src/main/java/fr/xephi/authme/settings/Messages.java

@@ -1,6 +1,7 @@
 package fr.xephi.authme.settings;
 
 import fr.xephi.authme.ConsoleLogger;
+import fr.xephi.authme.util.StringUtils;
 import org.bukkit.command.CommandSender;
 
 import java.io.File;
@@ -13,7 +14,7 @@ public class Messages extends CustomConfiguration {
 
     /** The section symbol, used in Minecraft for formatting codes. */
     private static final String SECTION_SIGN = "\u00a7";
-    private static Messages singleton = null;
+    private static Messages singleton;
     private String language = "en";
 
 
@@ -26,7 +27,6 @@ public class Messages extends CustomConfiguration {
     public Messages(File file, String lang) {
         super(file);
         load();
-        singleton = this;
         this.language = lang;
     }
 
@@ -70,6 +70,10 @@ public class Messages extends CustomConfiguration {
         return retrieve(key.getKey());
     }
 
+    public String retrieveSingle(MessageKey key) {
+        return StringUtils.join("\n", retrieve(key.getKey()));
+    }
+
     /**
      * Retrieve the message from the text file and returns it split by new line as an array.
      *