Do not use meta element for stating a document language.
Per
@@ -227,7 +227,6 @@ print_html_header (FILE * fp)
"<head>"
"<meta charset='UTF-8' />"
"<meta http-equiv='X-UA-Compatible' content='IE=edge'>"
- "<meta http-equiv='Content-Language' content='en'>"
"<meta name='google' content='notranslate'>"
"<meta name='viewport' content='width=device-width, initial-scale=1'>"
"<meta name='robots' content='noindex, nofollow' />");
