diff --git a/www/access.php b/www/access.php
index 7019b8a..760c40e 100644
--- a/www/access.php
+++ b/www/access.php
@@ -43,7 +43,7 @@ if ($client['api']) {
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">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="de">
<head>
<meta charset="UTF-8"/>
<title><?php echo $client['name']; ?> - Elwig</title>
diff --git a/www/clients.php b/www/clients.php
index 9056bb9..d458769 100644
--- a/www/clients.php
+++ b/www/clients.php
@@ -107,7 +107,7 @@ if ($path == '') {
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">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="de">
<head>
<meta charset="UTF-8"/>
<title>Mandanten - Elwig</title>
diff --git a/www/de/index.xhtml b/www/de/index.xhtml
index b3f9c2f..be48ab2 100644
--- a/www/de/index.xhtml
+++ b/www/de/index.xhtml
@@ -21,7 +21,7 @@
<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>
diff --git a/www/en/index.xhtml b/www/en/index.xhtml
index 8d3a814..265dd88 100644
--- a/www/en/index.xhtml
+++ b/www/en/index.xhtml
@@ -21,7 +21,7 @@
<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>
diff --git a/www/files/index.php b/www/files/index.php
index 4b73348..87f7338 100644
--- a/www/files/index.php
+++ b/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>