Ajout du FR

Ajout du FR + correction du "functions.php"

vendor/symfony/polyfill-php54/README.md

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+Symfony Polyfill / Php54
+========================
+
+This component provides functions unavailable in releases prior to PHP 5.4:
+
+- [`trait_exists`](http://php.net/trait_exists)
+- [`class_uses`](http://php.net/class_uses)
+- [`hex2bin`](http://php.net/hex2bin)
+- [`session_register_shutdown`](http://php.net/session_register_shutdown)
+
+More information can be found in the
+[main Polyfill README](https://github.com/symfony/polyfill/blob/master/README.md).
+
+License
+=======
+
+This library is released under the [MIT license](LICENSE).