You need upload THE FULL ZIPFILE with your edited CSV file.
1)Download the localization pack again
2) Carefully unzip it, carefully open the CSV file and paste your translations over
3) Zip the full folder again
4) Upload it again to Itch.
To reiterate: the content of your zipfile must look like this
Yours looks like this...
You are just uploading a broken bit of the game, of course it doesn't work