merged branch gido/patch-1 (PR #467)

Commits
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f1906e07 [doc] /{locale} -> /{_locale}

Discussion
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[docs] /{locale} -> /{_locale}

doc/providers/translation.rst

@@ -81,7 +81,7 @@ the ``translator.domains`` parameter::
         ),
     );
 
-    $app->get('/{locale}/{message}/{name}', function ($message, $name) use ($app) {
+    $app->get('/{_locale}/{message}/{name}', function ($message, $name) use ($app) {
         return $app['translator']->trans($message, array('%name%' => $name));
     });