Adds a command for un-waxing a sign

src/main/java/net/knarcraft/placeholdersigns/config/PlaceholderSignMessage.java

@@ -62,6 +62,11 @@ public enum PlaceholderSignMessage implements TranslatableMessage {
      * The message displayed when a protection plugin cancels the sign change event
      */
     ERROR_CANCELLED_BY_PROTECTION,
+
+    /**
+     * The message displayed when a sign has been successfully un-waxed
+     */
+    SUCCESS_SIGN_UN_WAXED,
     ;
 
     @Override