Hello Julien,
> * hydra/nginx/berlin.scm (%extra-content): Autoredirect 'eo', 'ko' and > 'ru' > to the translated website. I had to revert this one that causes the following nginx error: 2021/04/07 17:05:08 [emerg] 94058#0: variable already defined: "lang" in /gnu/store/ajvqgc205hvrfab7plbwds2a9wiqj52f-nginx.conf:4666 Mathieu