Here are the steps, from labnol.org:
- Open the Google Script and choose File -> Make a copy to create a personal copy of that feed translation script into your Google Drive.
- Replace the source language (line #4), the target language (line #7) and the RSS feed URL (line #10) with your own values. (some language codes here)
- Go to File -> Manage Versions and choose Save a new version. You may leave the description field blank.
- Go to Publish -> Deploy as Web App, choose “Anyone, even Anonymous” under “Who can access the app” and click the Deploy button.
If you wish to translate another RSS feed, or offer the same feed but in another language, just go back to step #1.
How to Translate RSS Feeds with Google Scripts