Update translation.rst

Author: noniagriconomie

translation.rst

@@ -410,6 +410,15 @@ The ``trans`` filter can be used to translate *variable texts* and complex expre
         {{ message|trans|raw }}
         {{ '<h3>bar</h3>'|trans|raw }}
 
+.. tip::
+
+    When a number is provided as a parameter named "%count%", the message is parsed for plural
+    forms and a translation is chosen according to this number using the following rules:
+
+    .. code-block:: twig
+
+       {{ message|trans({'%name%': 'Fabien', '%count%' => 1}, 'app') }}
+
 .. tip::
 
     You can set the translation domain for an entire Twig template with a single tag: