Fix #349 Create method on Messages to pass tag replacements

- Add tests
- Fix placeholder in some files

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

@@ -47,6 +47,31 @@ public class Messages {
         }
     }
 
+    /**
+     * Send the given message code to the player with the given tag replacements. Note that this method
+     * issues an exception if the number of supplied replacements doesn't correspond to the number of tags
+     * the message key contains.
+     *
+     * @param sender The entity to send the message to
+     * @param key The key of the message to send
+     * @param replacements The replacements to apply for the tags
+     */
+    public void send(CommandSender sender, MessageKey key, String... replacements) {
+        String message = retrieveSingle(key);
+        String[] tags = key.getTags();
+        if (replacements.length != tags.length) {
+            throw new RuntimeException("Given replacement size does not match the tags in message key '" + key + "'");
+        }
+
+        for (int i = 0; i < tags.length; ++i) {
+            message = message.replace(tags[i], replacements[i]);
+        }
+
+        for (String line : message.split("\n")) {
+            sender.sendMessage(line);
+        }
+    }
+
     /**
      * Retrieve the message from the text file and return it split by new line as an array.
      *