Update app.php

config/app.php

@@ -1,5 +1,13 @@
 <?php
 
+function locales($key, $default)
+{
+    $value = env($key, $default);
+    $array = explode(',', $value);
+    $trimmedArray = array_map('trim', $array);
+    return $trimmedArray;
+}
+
 return [
 
     /*
@@ -11,7 +19,7 @@ return [
     |
     */
 
-    'supported_locales' => env('LOCALES', ['de', 'es', 'pt', 'zh', 'ms']),
+    'supported_locales' => locales('LOCALES', 'de, es, pt, zh, ms'),
 
     /*
     |--------------------------------------------------------------------------