Merge branch '4.4' into 5.1

* 4.4:
  add validator translation 99 for Italian language
  stop using the deprecated at() PHPUnit matcher
  Fix typehint phpdoc

Author: fabpot

Tests/FirewallTest.php

@@ -74,7 +74,7 @@ public function testOnKernelRequestStopsWhenThereIsAResponse()
             ->getMock()
         ;
         $event
-            ->expects($this->at(0))
+            ->expects($this->once())
             ->method('hasResponse')
             ->willReturn(true)
         ;