My Jekyll Homepage https://www.mertl-research.at/ is available in two languages. I have written a Jekyll Plugin which allows the handling of multiple languages. I have tried the jekyll-multiple-languages-plugin first, but it contained too many monkey patches and changes of core classes. So I have written a custom plugin that uses Jekyll Hooks only.
There is no documentation yet, but you can take a look at the code on Github.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!