How do i change language on website?

[Blueberryy]

I can see that this repo has en-US and i'm planning to translate it, but how do i change language on website? Like will you add some button when i make pull request?

[ctrlcctrlv]

This looks very complicated per this post by @jpallares: https://juan.pallares.me/configure-jekyll-multi-language-without-plugin/

If you're going to pursue such a PR you may want to follow that blog closely.