Merge branch '5.0' into 5.1

* 5.0:
  Fix abstract method name in PHP doc block
  Various cleanups
  [HttpClient] fix issues in tests
  Fixes sprintf(): Too few arguments in form transformer
  [Console] Fix QuestionHelper::disableStty()
  [Validator] Use Mime component to determine mime type for file validator
  validate subforms in all validation groups
  Update Hungarian translations
  Add meaningful message when Process is not installed (ProcessHelper)
  [PropertyAccess] Fix TypeError parsing again.
  [TwigBridge] fix fallback html-to-txt body converter
  [Security/Http] fix merge
  [ErrorHandler] fix setting $trace to null in FatalError
  [Form] add missing Czech validators translation
  [Validator] add missing Czech translations
  never directly validate Existence (Required/Optional) constraints

VersionStrategy/JsonManifestVersionStrategy.php

@@ -59,7 +59,7 @@ private function getManifestPath(string $path): ?string
 
             $this->manifestData = json_decode(file_get_contents($this->manifestPath), true);
             if (0 < json_last_error()) {
-                throw new \RuntimeException(sprintf('Error parsing JSON from asset manifest file "%s": '.json_last_error_msg(), $this->manifestPath));
+                throw new \RuntimeException(sprintf('Error parsing JSON from asset manifest file "%s": ', $this->manifestPath).json_last_error_msg());
             }
         }