Update copyright notices, update German language.

app/Providers/BroadcastServiceProvider.php

@@ -1,10 +1,23 @@
 <?php
+/**
+ * BroadcastServiceProvider.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+declare(strict_types = 1);
 
 namespace FireflyIII\Providers;
 
 use Illuminate\Support\Facades\Broadcast;
 use Illuminate\Support\ServiceProvider;
 
+/**
+ * Class BroadcastServiceProvider
+ *
+ * @package FireflyIII\Providers
+ */
 class BroadcastServiceProvider extends ServiceProvider
 {
     /**