Merge branch '6.3' into 6.4

* 6.3:
  [Validator] added missing Spanish translations
  [Messenger] Amazon SQS Delay has a max of 15 minutes
  Add missing translations using ChatGPT
  [Validator] added missing Finnish, Italian, and Serbian Cyryllic translations
  Add .github/sync-translations.php

Transport/Connection.php

@@ -327,7 +327,8 @@ public function send(string $body, array $headers, int $delay = 0, string $messa
         $parameters = [
             'QueueUrl' => $this->getQueueUrl(),
             'MessageBody' => $body,
-            'DelaySeconds' => $delay,
+            // Maximum delay is 15 minutes. See https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-timers.html.
+            'DelaySeconds' => min(900, $delay),
             'MessageAttributes' => [],
             'MessageSystemAttributes' => [],
         ];