refactor: simplify conditional logic

Author: zhyian

src/Infrastructure/Repository/WpQueryArgsBuilder.php

@@ -298,13 +298,15 @@ private function generateMetaKeys(array $prefixes, ?string $languageCode): array
     {
         $metaKeys = [];
 
+        /** @var string[] $prefixes */
         foreach ($prefixes as $prefix) {
-            if ($languageCode) {
+            if (is_string($languageCode) && $languageCode) {
                 $metaKeys[] = $prefix . $languageCode;
-            } else {
-                $metaKeys[] = $prefix . MultilingualString::EN;
-                $metaKeys[] = $prefix . MultilingualString::DE;
+                continue;
             }
+
+            $metaKeys[] = $prefix . MultilingualString::EN;
+            $metaKeys[] = $prefix . MultilingualString::DE;
         }
 
         return $metaKeys;

src/Infrastructure/RestApi/TranslatedDegreeProgramController.php

@@ -324,7 +324,7 @@ public function get_collection_params(): array
             'per_page' => $perPage,
             'search' => $search,
             'lang' => self::languageParam(),
-            'extended' => self::extendedParam()
+            'extended' => self::extendedParam(),
         ];
     }