Whenever I upload my .zip to test it, the game seems to start running automatically but only a black window shows up. I guess I'll just have to find a way to run a comparison between the unedited  i18n.js file and the one I've been working on, because right now I have no idea what I might have corrupted.

STILL, while I don't have the time, has anyone gone through the same? Do any of you savvier people have any guesses of what lines I need to look into? In case it's just something simple and common.

I should note I was already quite advanced on the first build when 1.1 was released, so I kept going and still haven't manually applied the fixes.

Assuming that you have the 1.0 version of the entire game,  you should probably spend some time reconciling the two versions because the 1.0 version of the game does not work when localized. (if you have the 1.1 version of the game files with the 1.0 version of i18n, then that's definitely a cause for error)

That being said, it's also possible that there is another error somewhere in your i18n... You can use your browser's Inspect tool and look at the errors it's throwing at you - if you are not comfortable with that, you can post your broken game here (or on  Discord) and someone an help you locate the fixes, it's usually pretty quick!