Q:

Tooltipster worked. Now : TypeError: $('.tooltip').tooltipster is not a function

I'm rebuilding a simple html/css website meant to be available in 2 languages. French and english. Both need tooltipster.
It is working perfectly on the french page. But not at all on the english page.
Error : 

TypeError: $('.tooltip').tooltipster is not a function. (In '$('.tooltip').tooltipster(
          )', '$('.tooltip').tooltipster' is undefined)

The function is define this way in the html.
$(document).ready(function() {
    $('.tooltip').tooltipster();
});

Why is it not working when the english page is the exact copy of the french page ?
Visible at : www.krypton.fr/krypton3/index.html ( for the french page )
www.krypton.fr/krypton3/index-en.html ( for the english page )

A:

It is not an exact copy, you have two scripts included twice on english page, which probably causes the error:

