www: Change de-AT to de

www/files/index.php

@@ -120,7 +120,7 @@ if ($format === 'json') {
     header('Content-Type: application/xhtml+xml; charset=UTF-8');
     echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
     ?>
-<html xmlns="http://www.w3.org/1999/xhtml" lang="de-AT" prefix="og: https://ogp.me/ns#">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="de" prefix="og: https://ogp.me/ns#">
 <head>
   <meta charset="UTF-8"/>
   <title>Downloads - Elwig</title>
@@ -141,7 +141,7 @@ if ($format === 'json') {
   <meta property="og:image:type" content="image/jpeg"/>
   <meta property="og:image:width" content="1200"/>
   <meta property="og:image:height" content="630"/>
-  <meta property="og:locale" content="de_AT"/>
+  <meta property="og:locale" content="de"/>
   <meta property="og:ttl" content="60"/>
   <meta name="twitter:card" content="summary_large_image"/>
 </head>