Adds information about Pluralized Translations

Author: kane-menicou

components/translation/usage.rst

@@ -168,6 +168,22 @@ use for translation::
 
 .. _retrieving-the-message-catalogue:
 
+Pluralized Translations
+-----------------------
+
+Translations can be pluralized using `interval notations`_, the count can be
+provided using the `%count%` option::
+
+    $translator->trans(
+        '{0} There are no apples|{1} There is one apple|]1,Inf[ There are %count% apples',
+        ['%count%' => 10],
+        'messages',
+        'fr_FR'
+    );
+
+The Translator also supports pluralization using the ICU MessageFormat, read
+:doc:`/translation/message_format` for more information about using it.
+
 Retrieving the Message Catalog
 ------------------------------
 
@@ -248,3 +264,5 @@ code needed to generate the previous XLIFF file::
     ]);
 
 .. _`L10n`: https://en.wikipedia.org/wiki/Internationalization_and_localization
+
+.. _`interval notations`: https://en.wikipedia.org/wiki/Interval_(mathematics)