Merge branch '5.2' into 5.x

* 5.2:
  [TwigBridge] Install symfony/intl to run tests on Travis
  [Translation] Make `name` attribute optional in xliff2
  [Security] #[CurrentUser] argument should resolve to null when it is anonymous

Author: chalasr

composer.json

@@ -30,6 +30,7 @@
         "symfony/form": "^5.3",
         "symfony/http-foundation": "^4.4|^5.0",
         "symfony/http-kernel": "^4.4|^5.0",
+        "symfony/intl": "^4.4|^5.0",
         "symfony/mime": "^5.2",
         "symfony/polyfill-intl-icu": "~1.0",
         "symfony/property-info": "^4.4|^5.1",