Custom Laravel validation messages

I'm trying to create customized messages for validation in Laravel 5. Here is what I have tried so far:

$messages = [
    'required'  => 'Harap bagian :attribute di isi.',
    'unique'    => ':attribute sudah digunakan',
];
$validator = Validator::make($request->all(), [
    'username' => array('required','unique:Userlogin,username'),
    'password' => 'required',
    'email'    => array('required','unique:Userlogin,email'),$messages
]);

if ($validator->fails()) { 
    return redirect('/')
        ->withErrors($validator) // send back all errors to the login form
        ->withInput();
} else {
    return redirect('/')
        ->with('status', 'Kami sudah mengirimkan email, silahkan di konfirmasi');   
}   

But it's not working. The message is still the same as the default one. How can I fix this, so that I can use my custom messages?

If you use $this->validate() simplest one, then you should write code something like this..

$rules = [
        'name' => 'required',
        'email' => 'required|email',
        'message' => 'required|max:250',
    ];

    $customMessages = [
        'required' => 'The :attribute field is required.'
    ];

    $this->validate($request, $rules, $customMessages);