Symfony polyfill for intl's ICU-related data and classes

 This component provides fallback implementations when the Intl extension is
 not installed. It is limited to the "en" locale and to:
 .
  * intl_is_failure()
  * intl_get_error_code()
  * intl_get_error_message()
  * intl_error_name()
  * Collator
  * NumberFormatter
  * Locale
  * IntlDateFormatter
 .
 The Symfony Polyfill project backports features found in the latest PHP
 versions and provides compatibility layers for some extensions and functions.
 It is intended to be used when portability across PHP versions and extensions
 is desired.
 .
 Symfony is a PHP framework, a set of tools and a development methodology.