Middleware.php

<?php namespace Keevitaja\TestModule;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Translation\Translator;

class LoadTranslations
{
    protected $trans;

    public function __construct(Translator $trans)
    {
        $this->trans = $trans;
    }

    public function handle(Request $request, Closure $next)
    {
        $this->trans->addLines([
            'message.logged_out' => 'testing'
        ], 'en', 'anomaly.module.users');

        dd($this->trans->trans('anomaly.module.users::message.logged_out'));

        return $next($request);
    }
}