Hey,
Too late for the translation this time, but I think I figured out how to load it in a mod:
1. Create the folder structure as per Mod guidance. Do not change anything in the manifest other than customizing author, name etc.
2. Create subfolders: data\common\localization\locales
3. Add the csv file with the translation here
You will need to relaunch the game to see the language option in the top-left list in the main view.
Happy days