[Form] [Validator] Fixed post_max_size = 0 bug (Issue #8065)
Merge branch '2.1' into 2.2

* 2.1:
  fixed typo in CS translation (closes #8069)
  [Form] [Validator] Fixed post_max_size = 0 bug (Issue #8065)

Conflicts:
	src/Symfony/Component/Form/Tests/Extension/Validator/Constraints/FormValidatorTest.php
	src/Symfony/Component/Validator/Resources/translations/validators.cs.xlf