[ExpressionLanguage] Fixed an issue with # characters in double quoted string literals
Merge branch '2.4' into 2.5

* 2.4:
  [Translator] Use quote to surround invalid locale
  Optimize assertLocale regexp
  [ExpressionLanguage] Fixed an issue with # characters in double quoted string literals
  Add some tweaks to the pt_BR translations
  [Validator] Backported #11410 to 2.3: Object initializers are called only once per object
  [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator
  [Process] Reduce I/O load on Windows platform
  [Form] Check if IntlDateFormatter constructor returned a valid object before using it

Conflicts:
	src/Symfony/Component/Validator/Tests/ValidationVisitorTest.php