Merge branch '3.4' into 4.4

* 3.4:
  [Translation] Add missing use statement
  [Translation][Debug] Add installation and minimal example to README
  [Validator] try to call __get method if property is uninitialized
  Fix handling of empty_data's \Closure value in Date/Time form types

README.md

@@ -3,10 +3,28 @@ Translation Component
 
 The Translation component provides tools to internationalize your application.
 
+Getting Started
+---------------
+
+```
+$ composer require symfony/translation
+```
+
+```php
+use Symfony\Component\Translation\Translator;
+
+$translator = new Translator('fr_FR');
+$translator->addResource('array', [
+    'Hello World!' => 'Bonjour !',
+], 'fr_FR');
+
+echo $translator->trans('Hello World!'); // outputs « Bonjour ! »
+```
+
 Resources
 ---------
 
-  * [Documentation](https://symfony.com/doc/current/components/translation.html)
+  * [Documentation](https://symfony.com/doc/current/translation.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)