Merge branch '2.7' into 2.8

* 2.7:
  [FrameworkBundle] Fix Incorrect line break in exception message (500 debug page)
  Minor cleanups and improvements
  [form] lazy trans `post_max_size_message`.
  [DI] Fix setting synthetic services on ContainerBuilder
  [ClassLoader] Fix ClassCollectionLoader inlining with declare(strict_types=1)

Author: fabpot

Resources/public/css/body.css

@@ -39,7 +39,7 @@ build: 56
     font-family: Georgia, "Times New Roman", Times, serif;
     font-size: 20px;
     color: #313131;
-    word-break: break-all;
+    word-wrap: break-word;
 }
 .sf-reset li {
     padding-bottom: 10px;