I suggest to set the charset with the Content-type. That will make things go faster with the browsers.

Regarding to: 
https://developers.google.com/speed/docs/best-practices/rendering#SpecifyCharsetEarly

Specifying a character set in the HTTP response headers of your HTML documents allows the browser to begin parsing HTML and executing scripts immediately.

Regards,
Kay-Michael

diff --git a/config/cfgroot/header.pl b/config/cfgroot/header.pl
index bbb0eca..7c36820 100644
--- a/config/cfgroot/header.pl
+++ b/config/cfgroot/header.pl
@@ -164,7 +164,7 @@
  print "Pragma: no-cache\n";
  print "Cache-control: no-cache\n";
  print "Connection: close\n";
- print "Content-type: text/html\n\n";
+ print "Content-type: text/html; charset=UTF-8\n\n";
 }
 
 sub is_menu_visible($) {