I can confirm that on Google Chrome, the first preferred language will be the UI language shown.
kennyfully88
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That man is very informative about what he is doing!
Anyway, I also found this link (made by the same guy in the YouTube video)
https://www.hackingwithswift.com/100/45
That isn't exactly a full enhanced tutorial, but gives a beginner like me a better idea of how to make something. Thank you for pushing me in the right direction!