What to do when CSV file changes are not being applied in frontend

So you have translated several labels in a i18n CSV file, but somehow they are not being displayed in the frontend?

I had the same issue. So I tried to flush the cache and even rebuild the static files several times, but Magento did not seem to pick up the change.

To fix this I had to clear the pub/static folder. To be more precise, I had to remove the js-translation.json file which causes the issue.