Hi, tried to fix the polish localization in the original Sunward Isles mod but for some reason it didn't work. As it turned out this mod here uses all the localization files as the base mod and it keep overriding all the changes I was trying to make. So here are the files that you need to replace:

https://drive.google.com/file/d/16X0Hb5mnp4bqLjbNcJnDJUpoSuTMrar-/view?usp=sharing

In theory this mod doesn't need all the localization files (if any at all) but if you want to keep it the way it works now you should replace all the files.

Edit. Few more lines needed to be changed.