Merge branch '3.4' into 4.4

* 3.4:
  [Validator] Add missing vietnamese translations
  add German translation
  [Validator][ConstraintValidator] Update wrong PRETTY_DATE doc
  [DomCrawler][Form] Fix PHPDoc on get & offsetGet
  prevent method calls on null values
  Return int if scale = 0

Author: fabpot

Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php

@@ -279,7 +279,7 @@ private function round($number)
                     break;
             }
 
-            $number /= $roundingCoef;
+            $number = 1 === $roundingCoef ? (int) $number : $number / $roundingCoef;
         }
 
         return $number;

Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php

@@ -370,7 +370,7 @@ public function testReverseTransformWithRounding($scale, $input, $output, $round
     {
         $transformer = new NumberToLocalizedStringTransformer($scale, null, $roundingMode);
 
-        $this->assertEquals($output, $transformer->reverseTransform($input));
+        $this->assertSame($output, $transformer->reverseTransform($input));
     }
 
     public function testReverseTransformDoesNotRoundIfNoScale()