package me.stefvanschie.buildinggame.managers.messages;

import me.stefvanschie.buildinggame.managers.files.SettingsManager;

import org.bukkit.command.CommandSender;

public class MessageManager {

	private MessageManager() {}
	
	private static MessageManager instance = new MessageManager();
	
	public static MessageManager getInstance() {
		return instance;
	}
	
	public void send(CommandSender sender, String message) {
		if (message.equals("")) {
			return;
		}
		
		sender.sendMessage(SettingsManager.getInstance().getMessages().getString("global.prefix")
				.replaceAll("&", "§") + message
				.replaceAll("&", "§"));
	}
	
	public void sendWithoutPrefix(CommandSender sender, String message) {
		if (message.equals("")) {
			return;
		}
		
		sender.sendMessage(message
				.replaceAll("&", "§"));
	}
	
}

package me.stefvanschie.buildinggame.managers.messages;

import me.stefvanschie.buildinggame.managers.files.SettingsManager;

import org.bukkit.command.CommandSender;

public class MessageManager {

	private MessageManager() {}
	
	private static MessageManager instance = new MessageManager();
	
	public static MessageManager getInstance() {
		return instance;
	}
	
	public void send(CommandSender sender, String message) {
		if (message.equals("")) {
			return;
		}
		
		sender.sendMessage(SettingsManager.getInstance().getMessages().getString("global.prefix")
				.replace("%:a%", "ä")
				.replace("%:e%", "ë")
				.replace("%:i%", "ï")
				.replace("%:o%", "ö")
				.replace("%:u%", "ü")
				.replace("%ss%", "ß")
				.replaceAll("&", "§") + message
				.replace("%:a%", "ä")
				.replace("%:e%", "ë")
				.replace("%:i%", "ï")
				.replace("%:o%", "ö")
				.replace("%:u%", "ü")
				.replace("%ss%", "ß")
				.replaceAll("&", "§"));
	}
	
	public void sendWithoutPrefix(CommandSender sender, String message) {
		if (message.equals("")) {
			return;
		}
		
		sender.sendMessage(message
				.replace("%:a%", "ä")
				.replace("%:e%", "ë")
				.replace("%:i%", "ï")
				.replace("%:o%", "ö")
				.replace("%:u%", "ü")
				.replace("%ss%", "ß")
				.replaceAll("&", "§"));
	}
	
}

Update MessageManager.java