Looks nice. I like the idea. I wish the UI could be improved more. For example, I see all the languages on left, they could be sorted by the number of codes in a descending order. There is just too much white color. I am color blind, maybe you could have used Bootstrap or Material to get started. I see "No title" everywhere, do we need to see "No title" or maybe not show anything?

I assume the back-end is very straightforward (basic abstraction over S3), so please focus on the front-end.