Merge branch '5.4' into 6.4

* 5.4:
  [HttpClient][Mailer] Revert "Let curl handle transfer encoding", use HTTP/1.1 for Mailgun
  Reviewed Catalan missing translations
  Fix typo: synchronous -> synchronously
  [Serializer] Check if exception message in test is correct
  Ibexa is sponsoring Symfony 5.4, thanks to them! \o/
  [String] Add `alias` case to `EnglishInflector`

MailerInterface.php

@@ -15,7 +15,7 @@
 use Symfony\Component\Mime\RawMessage;
 
 /**
- * Interface for mailers able to send emails synchronous and/or asynchronous.
+ * Interface for mailers able to send emails synchronously and/or asynchronously.
  *
  * Implementations must support synchronous and asynchronous sending.
  *