Override the locale string UF provides to a legal language identifier [ZN-MDD-14]

src/ServicesProvider/ServicesProvider.php

@@ -18,6 +18,7 @@ use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use UserFrosting\Sprinkle\Core\Log\MixedFormatter;
 use UserFrosting\Sprinkle\UFTweaks\Twig\HasRoleExtension;
+use UserFrosting\Sprinkle\UFTweaks\Twig\LocaleOverrideExtension;
 use UserFrosting\Sprinkle\UFTweaks\Twig\MobileDetectExtension;
 use UserFrosting\Sprinkle\UFTweaks\Mail\RetryMailer;
 
@@ -185,6 +186,7 @@ class ServicesProvider
 
             $twig->addExtension(new HasRoleExtension($c));
             $twig->addExtension(new MobileDetectExtension($c));
+            $twig->addExtension(new LocaleOverrideExtension($c));
 
             return $view;
         });