Restructure translatable docs

Author: natewiebe13

translation.rst

@@ -304,21 +304,22 @@ sure how it would be translated. For example, it could be translated multiple
 times if intended to be displayed to multiple users.
 
 Instead of translating a string at the time of creation, a ``Translatable``
-object can be created that can then be translated when used::
+object can be created that can then be translated when used. Later this message
+can be translated with a translator in either PHP or in Twig.
+
+PHP::
 
     $message = new Translatable('Symfony is great!');
     $message = t('Symfony is great!');
 
-Later this message can be translated with a translator in either PHP or in Twig.
-
-PHP::
-
     Translatable::trans($translator, $message);
 
 Twig:
 
 .. code-block:: html+twig
 
+    {% set message = t('Symfony is great!') %}
+
     <h1>{{ message|trans }}</h1>
 
 .. _translation-in-templates: