When in a symfony application we upload a big file, this upload causes POST request to exceed PHP post_max_size variable defined in php.ini (if file size exceed post_max_size),
Symfony framework manage this error, but it seems there is a regression -->

In Vendor FormType.php, the function configureOptions set a default attribute 'post_max_size_message' => 'The uploaded file was too large. Please try to upload a smaller file.'

Then in NativeRequestHandler

$form->addError(new FormError(
                $form->getConfig()->getOption('post_max_size_message'),
                null,
                array('{{ max }}' => $this->serverParams->getNormalizedIniPostMaxSize())
 ));

As we can see, the message $form->getConfig()->getOption('post_max_size_message') is not translated. Or in twig the form errors are displayed without doing a {{ error|trans }} (see in vendor twig templates the definition of the block form_errors) then in our generated html pages we have form errors all translated but this one. All the form error messages must be translated before being passed as a parameter to new FormError(...).

There is the same problem in HttpFoundationRequestHandler.

I verified that all other new FormError(...) declared in vendors take a translated message as parameter and it's the case.