Premium URL Shortener allows you to upload these files directly via the admin panel. Just download then go to Admin > Languages > Upload and upload them. In some cases it might not be able to upload these due to server permission so you will need to manually upload these and extract them in the storage/languages folder..
Language files are created in batch using Google API and/or DeepL, so the translation might not be perfect. You can easily modify them via the admin panel.