Merge branch '2.8' into 3.0

* 2.8:
  Updated all the README files
  [TwigBundle] Fix failing test on appveyor
  Improved the error message when using "@" in a decorated service
  Improve error reporting in router panel of web profiler
  [DoctrineBridge][Form] Fix performance regression in EntityType
  [FrameworkBundle] Fix a regression in handling absolute and namespaced template paths
  Allow to normalize \Traversable
  minor [Form] fix tests added by #16886
  Remove _path from query parameters when fragment is a subrequest and request attributes are already set Added tests for _path removal in FragmentListener
  Simplified everything
  Added a test
  Fixed the problem in an easier way
  Fixed a syntax issue
  Improved the error message when a template is not found
  [CodingStandards] Conformed to coding standards
  [TwigBundle] fixed Include file locations in "Template could not be found" exception

Author: fabpot

README.md

@@ -1,37 +1,13 @@
 Translation Component
 =====================
 
-Translation provides tools for loading translation files and generating
-translated strings from these including support for pluralization.
-
-```php
-use Symfony\Component\Translation\Translator;
-use Symfony\Component\Translation\MessageSelector;
-use Symfony\Component\Translation\Loader\ArrayLoader;
-
-$translator = new Translator('fr_FR', new MessageSelector());
-$translator->setFallbackLocales(array('fr'));
-$translator->addLoader('array', new ArrayLoader());
-$translator->addResource('array', array(
-    'Hello World!' => 'Bonjour',
-), 'fr');
-
-echo $translator->trans('Hello World!')."\n";
-```
+The Translation component provides tools to internationalize your application.
 
 Resources
 ---------
 
-Silex integration:
-
-https://github.com/silexphp/Silex/blob/master/src/Silex/Provider/TranslationServiceProvider.php
-
-Documentation:
-
-https://symfony.com/doc/3.0/book/translation.html
-
-You can run the unit tests with the following command:
-
-    $ cd path/to/Symfony/Component/Translation/
-    $ composer install
-    $ phpunit
+  * [Documentation](https://symfony.com/doc/current/components/translation/index.html)
+  * [Contributing](https://symfony.com/doc/current/contributing/index.html)
+  * [Report issues](https://github.com/symfony/symfony/issues) and
+    [send Pull Requests](https://github.com/symfony/symfony/pulls)
+    in the [main Symfony repository](https://github.com/symfony/symfony)