add default view locale parameter

core/Controller/Site/PageController.php

@@ -42,6 +42,7 @@ class PageController extends AbstractController
             '_page' => $this->siteRequest->getPage(),
             '_menu' => $this->siteRequest->getMenu(),
             '_navigation' => $this->siteRequest->getNavigation(),
+            '_locale' => $this->siteRequest->getNavigation()->getLocale(),
             '_store' => $this->siteStore,
         ];
     }

templates/page/simple/page.html.twig

@@ -72,6 +72,9 @@
         Locale:
 
         <ul>
+            <li>
+                Var: {{ _locale }}
+            </li>
             <li>
                 Navigation: {{ _navigation.locale }}
             </li>