Merge branch '3.1'

* 3.1:
  [TwigBridge] fix tests
  Tag the FormFieldRegistry as being internal
  [Form] Fix Date\TimeType marked as invalid on request with single_text and zero seconds
  [FrameworkBundle] Register the ArrayDenormalizer
  [Serializer] Fix DataUriNormalizer's regex
  [Validator] Added missing swedish translation
  [TranslationDebug] workaround for getFallbackLocales.
  [Translation] fixed nested fallback catalogue  using multiple locales.
  fixed phpdoc
  [Command] Fixed method comments as phpDoc syntax
  Added single quotes for upgrade guides.

Author: fabpot

Normalizer/DataUriNormalizer.php

@@ -85,7 +85,7 @@ public function supportsNormalization($data, $format = null)
      */
     public function denormalize($data, $class, $format = null, array $context = array())
     {
-        if (!preg_match('/^data:([a-z0-9]+\/[a-z0-9]+(;[a-z0-9\-]+\=[a-z0-9\-]+)?)?(;base64)?,[a-z0-9\!\$\&\\\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i', $data)) {
+        if (!preg_match('/^data:([a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}\/[a-z0-9][a-z0-9\!\#\$\&\-\^\_\+\.]{0,126}(;[a-z0-9\-]+\=[a-z0-9\-]+)?)?(;base64)?,[a-z0-9\!\$\&\\\'\,\(\)\*\+\,\;\=\-\.\_\~\:\@\/\?\%\s]*\s*$/i', $data)) {
             throw new UnexpectedValueException('The provided "data:" URI is not valid.');
         }