Language of FedEX tracking website

Hi!

We need to redirect our customers to Spanish language Fedex tracking website. there is only FedEx US shipping provider option so I chose that one.

Before we were able to manually send this URL example in Spanish: https://www.fedex.com/apps/fedextrack/?cntry_code=es&language=es&tracknumbers= 812143733642

But now it redirect to this other in english:
https://www.fedex.com/fedextrack/?trknbr=812143733642

Some customers do not understand english and they do not like this new option.

We would be happy to use US Fedex website, but in spanish, not in english.

What could we do?
Thanks a lot