Update copyright notices, update German language.

app/Http/Controllers/ImportController.php

@@ -6,6 +6,7 @@
  * 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\Http\Controllers;
 
@@ -306,7 +307,7 @@ class ImportController extends Controller
     public function start(ImportJob $job)
     {
         set_time_limit(0);
-        if ($job->status == "settings_complete") {
+        if ($job->status == 'settings_complete') {
             ImportProcedure::runImport($job);
         }
     }
@@ -450,8 +451,7 @@ class ImportController extends Controller
                 Log::debug('Will redirect to complete()');
 
                 return redirect(route('import.complete', [$job->key]));
-            case
-            'import_complete':
+            case 'import_complete':
                 Log::debug('Will redirect to finished()');
 
                 return redirect(route('import.finished', [$job->key]));