Translations for Biodiversity.
Duplicate an existing folder, rename it to a short internal letter code and ensure that the containing .json file is renamed to the same 2 letter code. Then edit the __name attribute to the name of the language and you can begin translating.
To make sure everything is formatted correctly, the python script build.py handles converting the language translations into the format the mod reads.
For changes to existing languages, simply copying the build directory after running the script into the lang folder of the mod directory will update it.
Important
For new languages it requires the mod .dll to be rebuilt (defs.json is contained inside the dll).
As a workaround you can replace the contents of en.json in the lang folder with <your language>.json and test like that.