Merge branch '2.8'

* 2.8:
  Fixed the wrong source name and the ja translation
  [Debug] fix readme: DebugClassLoader moved to debug itself
  [SecurityBundle] disable the init:acl command if ACL is not used
  [DI] remove useless condition around unset
  [Console] Fix bug with  overloading
  [Form] Fixed wrong usages of the "text" type
  [Form] Disabled view data validation if "data_class" is set to null
  [HttpFoundation] Workaround HHVM rewriting HTTP response line

DebugClassLoader.php

@@ -120,7 +120,7 @@ class DebugClassLoader
         try {
             if ($this->isFinder) {
                 if ($file = $this->classLoader[0]->findFile($class)) {
-                    require $file;
+                    require_once $file;
                 }
             } else {
                 call_user_func($this->classLoader, $class);

ExceptionHandler.php

@@ -11,7 +11,6 @@
 
 namespace Symfony\Component\Debug;
 
-use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Debug\Exception\FlattenException;
 use Symfony\Component\Debug\Exception\OutOfMemoryException;
 

README.md

@@ -15,6 +15,7 @@ Debug::enable();
 You can also use the tools individually:
 
 ```php
+use Symfony\Component\Debug\DebugClassLoader;
 use Symfony\Component\Debug\ErrorHandler;
 use Symfony\Component\Debug\ExceptionHandler;
 
@@ -25,13 +26,11 @@ if ('cli' !== php_sapi_name()) {
     ini_set('display_errors', 1);
 }
 ErrorHandler::register();
+DebugClassLoader::enable();
 ```
 
-Note that the `Debug::enable()` call also registers the debug class loader
-from the Symfony ClassLoader component when available.
-
 This component can optionally take advantage of the features of the HttpKernel
-and HttpFoundation components.
+component.
 
 Resources
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