While I'm only 1/4th into the video so far, holy hell, that Atom editor is amazing. Being able to add the entire game folder into the project and then look for certain values throughout all of these files is a godsend. Thanks to that I finally found the solution to my issue of not being able to add a clickable name of my custom region to a custom tooltip.I started with this video, which got me set up with a good text editor that helps browse the existing file structure and copy/paste files into my own mod directory where needed. I highly recommend it as it patiently walks you through the basics without assuming you know... anything. Plus it's only a half-hour long so it stays on topic.
For future reference for anyone who wants to do something like that, you do this directly in the localization file, with no need for custom localization scope in whatever file you put the connection to the localization value in. And the line is: