phpstan, phpcs, phpunit fixes

Theme/Backend/Lang/api.de.lang.php

@@ -0,0 +1,16 @@
+<?php
+/**
+ * Karaka
+ *
+ * PHP Version 8.1
+ *
+ * @package   Modules\Checklist
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://jingga.app
+ */
+declare(strict_types=1);
+
+return ['Checklist' => [
+]];

Theme/Backend/Lang/api.en.lang.php

@@ -12,5 +12,5 @@
  */
 declare(strict_types=1);
 
-return ['Navigation' => [
+return ['Checklist' => [
 ]];