Merge branch '2.8' into 3.0

* 2.8:
  [VarDumper] Fix tests on PHP 7
  [DomCrawler] Clarify the value returned by getPhpFiles()
  [DependencyInjection] Fix #16461 Let Container::set() replace existing aliases
  avoid (string) catchable fatal error for instances of __PHP_Incomplete_Class
  remove unnecessary retrieval and setting of data
  Update validators.fr.xlf
  avoid (string) catchable fatal error for __PHP_Incomplete_Class instances
  sendContent return as parent.
  [DomCrawler] Remove the overridden getHash() method to prevent problems when cloning the crawler
  [FrameworkBundle] Fix a typo
  Added more exceptions to singularify method
  Add width attribute on SVG
  [FrameworkBundle] Support autowiring for TranslationInterface
  [WebProfiler] Fixed styles for search block and menu profiler for IE Edge

Conflicts:
	src/Symfony/Component/DependencyInjection/Tests/ContainerTest.php
	src/Symfony/Component/DomCrawler/Crawler.php

Author: nicolas-grekas

Command/TranslationUpdateCommand.php

@@ -47,8 +47,9 @@ protected function configure()
             ))
             ->setDescription('Updates the translation file')
             ->setHelp(<<<'EOF'
-The <info>%command.name%</info> command extract translation strings from templates
+The <info>%command.name%</info> command extracts translation strings from templates
 of a given bundle or the app folder. It can display them or merge the new ones into the translation files.
+
 When new translation strings are found it can automatically add a prefix to the translation
 message.
 

Resources/config/translation.xml

@@ -17,6 +17,8 @@
             <call method="setConfigCacheFactory">
                 <argument type="service" id="config_cache_factory" />
             </call>
+
+            <autowiring-type>Symfony\Component\Translation\TranslatorInterface</autowiring-type>
         </service>
 
         <service id="translator.logging" class="Symfony\Component\Translation\LoggingTranslator" public="false">