Merge branch '6.4' into 7.3

* 6.4: fix test setup [Validator] Review Turkish translations [Validator] Review Croatian translations [Validator] Review translations for Polish (pl) use the empty string instead of null as an array offset Review translations for Chinese (zh_TW) [Serializer] Adjust ObjectNormalizerTest for the accessor method changes from #61097

Author: xabbuh

ResponseHeaderBag.php

@@ -159,7 +159,7 @@ public function getCacheControlDirective(string $key): bool|string|null
 
  public function setCookie(Cookie $cookie): void
  {
- $this->cookies[$cookie->getDomain()][$cookie->getPath()][$cookie->getName()] = $cookie;
+ $this->cookies[$cookie->getDomain() ?? ''][$cookie->getPath()][$cookie->getName()] = $cookie;
  $this->headerNames['set-cookie'] = 'Set-Cookie';
  }
 
@@ -170,13 +170,13 @@ public function removeCookie(string $name, ?string $path = '/', ?string $domain
  {
  $path ??= '/';
 
- unset($this->cookies[$domain][$path][$name]);
+ unset($this->cookies[$domain ?? ''][$path][$name]);
 
- if (empty($this->cookies[$domain][$path])) {
- unset($this->cookies[$domain][$path]);
+ if (empty($this->cookies[$domain ?? ''][$path])) {
+ unset($this->cookies[$domain ?? ''][$path]);
 
- if (empty($this->cookies[$domain])) {
- unset($this->cookies[$domain]);
+ if (empty($this->cookies[$domain ?? ''])) {
+ unset($this->cookies[$domain ?? '']);
  }
  }