diff --git a/server/templates/_frame.html b/server/templates/_frame.html
index 0b9fc54..9e7a295 100644
--- a/server/templates/_frame.html
+++ b/server/templates/_frame.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="en" class="no-js">
+<html lang="{{ lang.code() }}" class="no-js">
 <head>
     <meta charset="utf-8"/>
     <meta name="viewport" content="width=device-width, initial-scale=1"/>
