Issue #3477822 by mrshowerman: Sorting of predefined language list doesnt work

src/Entity/CustomLanguageManager.php

@@ -184,7 +184,8 @@ class CustomLanguageManager {
           $standard_languages = \Drupal::languageManager()
             ->getStandardLanguageList();
           foreach ($standard_languages as $langcode => $language_names) {
-            $subsettable_languages[$langcode] = t($language_names[0]);
+            // Cast to string for proper sorting in all languages.
+            $subsettable_languages[$langcode] = (string) t($language_names[0]);
           }
           asort($subsettable_languages);