Whenever I change the language of trailhead from the bottom page, I login and everything, I open trailhead again once I restart browser, and it's always back to the locale language. How come this is not at least saved through profile? I am used to doing trailheads, and everything in english, spanish does not help me.

Whenever I change the language of trailhead from the bottom page, I login and everything, I open trailhead again once I restart browser, and it's always back to the locale language. How come this is not at least saved through profile? I am used to doing trailheads, and everything in english, spanish does not help me.

Hello! 
Please I would like how to choose my language in Thrailhead. http://developer.salesforce.com always open in french on my computer.
Thanks