Translate 'yesterday', 'now', 'today' and 'tomorrow' words with Laravel

CustomValidator.php

<?php

namespace App\Validator;

use Carbon\Carbon;

class CustomValidator extends \Illuminate\Validation\Validator {
    protected function getTimePeriods($parameter) {
        $keys = array_keys(trans('validation.time_periods'));
        $values = array_values(trans('validation.time_periods'));

        if (!in_array($parameter, $keys)) {
            $parameter = (new Carbon($parameter))->formatLocalized('%d de %B');
        }

        return str_replace(
            $keys,
            $values,
            $parameter
        );
    }

    public function replaceBefore($message, $attribute, $rule, $parameters) {
        return str_replace(':date', $this->getTimePeriods($parameters[0]), $message);
    }

    public function replaceAfter($message, $attribute, $rule, $parameters) {
        return str_replace(':date', $this->getTimePeriods($parameters[0]), $message);
    }
}

validation.php

<?php

return [
    // ...
    'time_periods' => [
        'yesterday' => 'ontem',
        'now'       => 'agora',
        'today'     => 'hoje',
        'tomorrow'  => 'amanhã',
    ],
];

ValidatorServiceProvider.php

<?php

namespace App\Providers;

use Validator;
use Illuminate\Support\ServiceProvider;
use App\Validator\CustomValidator;

class ValidatorServiceProvider extends ServiceProvider
{
    /**
     * Register services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

    /**
     * Bootstrap services.
     *
     * @return void
     */
    public function boot()
    {
        Validator::resolver(function($translator, $data, $rules, $messages) {
            return new CustomValidator($translator, $data, $rules, $messages);
        });
    }
}