I know it's been a bit since this has seen an update, so I wanted to chime in as I have submitted plenty of suggestions to the Google Doc via comments—mainly because that's mostly how I found it! I didn't know what GitHub it was on or this thread was a thing until now.
I want to see if there's any help that's needed, since there's clearly been a lot of progress and I don't want to see you all lose a lot of time on this project.
So far awesome work, and I'd love to contribute more text if needed or anything else that you might need. I did editing on the CT2018 fansubs too, if you want English text edited.