fix translating file validation error message

Author: xabbuh

Resources/config/form.xml

@@ -93,7 +93,7 @@
             <deprecated>The "%service_id%" service is deprecated since Symfony 3.1 and will be removed in 4.0.</deprecated>
         </service>
         <service id="form.type.file" class="Symfony\Component\Form\Extension\Core\Type\FileType" public="true">
-            <deprecated>The "%service_id%" service is deprecated since Symfony 3.1 and will be removed in 4.0.</deprecated>
+            <argument type="service" id="translator" on-invalid="ignore" />
         </service>
         <service id="form.type.hidden" class="Symfony\Component\Form\Extension\Core\Type\HiddenType" public="true">
             <deprecated>The "%service_id%" service is deprecated since Symfony 3.1 and will be removed in 4.0.</deprecated>