Hi!
I think you could go like this on the top of the index.php:
if(lang == French){
require_once("french_header.php");
}
elseif(lang == English){
require_once("english_header.php");
}
I dont know how you define what languages is active in the database so you have to replace "lang == French and lang == English with some definition.
A more simple way is to just change the header div and use the same header.php for all languages.
if(lang == French){
echo "";
}
elseif(lang == English){
echo ";
}