[Validator] Minor fix in XmlLoader
[Validator][Translation]update zh_CN translations

* add new trans-units
* change some translations
* change punctuations, whitespaces
Merge branch '2.3' into 2.4

* 2.3:
  fixed CS
  allow the TextAreaFormField to be used with valid/invalid HTML
  Create security.id.xlf
  [DependencyInjection] Remove unneeded file
  [Twig] removed obsolete conditions on Twig versions
  added lines to exceptions for the trans and transchoice tags
  [Form] Make FormInterface::add docblock more explicit
  [Security] Add zh_CN translations
  [Validator][Translation]update zh_CN translations
  [Validator] Minor fix in XmlLoader