Merge branch '2.3' into 2.5

* 2.3:
  fixed id for translations
  bumped Symfony version to 2.3.26
  Dutch translation for invalid charset message
  German translation for invalid charset message
  Add a Slovenian translation for invalid charset message
  Add a Polish translation.
  Test lowest deps with latest 5.3
  updated VERSION for 2.3.25
  update CONTRIBUTORS for 2.3.25
  updated CHANGELOG for 2.3.25
  Fix docblocks to comments
  [Validator] reject ill-formed strings
  [Validator] drop grapheme_strlen in LengthValidator
  Unique Entity Validator Invalid Value
  [FrameworkBundle][config] allow multiple fallback locales.

Conflicts:
	src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
	src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Validator/Resources/translations/validators.de.xlf
	src/Symfony/Component/Validator/Resources/translations/validators.en.xlf
	src/Symfony/Component/Validator/Resources/translations/validators.fr.xlf
	src/Symfony/Component/Validator/Resources/translations/validators.nl.xlf
	src/Symfony/Component/Validator/Resources/translations/validators.pl.xlf
	src/Symfony/Component/Validator/Resources/translations/validators.sl.xlf
	src/Symfony/Component/Validator/Tests/Constraints/LengthValidatorTest.php

Author: fabpot

Exception/FatalErrorException.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\HttpKernel\Exception;
 
-/**
+/*
  * Fatal Error Exception.
  *
  * @author Konstanton Myakshin <koc-dp@yandex.ru>

Exception/FlattenException.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\HttpKernel\Exception;
 
-/**
+/*
  * FlattenException wraps a PHP Exception to be able to serialize it.
  *
  * Basically, this class removes all objects from the trace.