fixed

Closes #3417825

modules/quant_search/src/Controller/Search.php

@@ -256,7 +256,7 @@ class Search extends ControllerBase {
 
       foreach ($entity->getTranslationLanguages() as $code => $lang) {
         $language_label = \Drupal::service('string_translation')->translate($language->getName(), [], ['langcode' => $code]);
-        $record["language_${code}"] = $language_label;
+       $record["language_{$code}"] = $language_label;
       }
     }