How to change headers on individual pages with Vantage Theme?

Hi!

I’m trying for the last hours to modify the header of only one page on the website I’m building for someone. The website is only 2 pages (one in french and the in English)

I need to be able to edit the headers of these 2 different pages so the language match and that the user can switch between French to English and vice versa.

How to change headers on individual pages with Vantage Theme?

The plugin : WP Display Header do not work and seem incompatible with Vantage.

I’m using this theme :
http://wp-themes.com/vantage/?TB_iframe=true&width=600&height=400

The website I’m working on :
http://www.transportlevy.com/

Please help
any help will be appreciate!