diff --git a/src/Bundle/ChillWopiBundle/src/Controller/Convert.php b/src/Bundle/ChillWopiBundle/src/Controller/Convert.php
index 0a4dc8762..aced2d0c5 100644
--- a/src/Bundle/ChillWopiBundle/src/Controller/Convert.php
+++ b/src/Bundle/ChillWopiBundle/src/Controller/Convert.php
@@ -18,6 +18,7 @@ use Chill\MainBundle\Entity\User;
 use Psr\Log\LoggerInterface;
 use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
 use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\RequestStack;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\Mime\Part\DataPart;
@@ -40,6 +41,8 @@ class Convert
 
     private LoggerInterface $logger;
 
+    private RequestStack $requestStack;
+
     private Security $security;
 
     private StoredObjectManagerInterface $storedObjectManager;
@@ -49,12 +52,14 @@ class Convert
      */
     public function __construct(
         HttpClientInterface $httpClient,
+        RequestStack $requestStack,
         Security $security,
         StoredObjectManagerInterface $storedObjectManager,
         LoggerInterface $logger,
         ParameterBagInterface $parameters
     ) {
         $this->httpClient = $httpClient;
+        $this->requestStack = $requestStack;
         $this->security = $security;
         $this->storedObjectManager = $storedObjectManager;
         $this->logger = $logger;
@@ -68,6 +73,10 @@ class Convert
         }
 
         $content = $this->storedObjectManager->read($storedObject);
+        $query = [];
+        if (null !== $request = $this->requestStack->getCurrentRequest()) {
+            $query['lang'] = $request->getLocale();
+        }
 
         try {
             $url = sprintf('%s/cool/convert-to/pdf', $this->collaboraDomain);
@@ -76,6 +85,7 @@ class Convert
             ]);
             $response = $this->httpClient->request('POST', $url, [
                 'headers' => $form->getPreparedHeaders()->toArray(),
+                'query' => $query,
                 'body' => $form->bodyToString(),
                 'timeout' => 10,
             ]);