You asked, we delivered.
We now support 9 different languages: English, Italian, German, French, Portuguese, Danish, Spanish, Korean, and Chinese (simplified).
Once you've successfully published or saved changes to your campaign, you will now see language selection available in the instructions window:
Remember to still enter the reward in your own language in the Offer step:
If you don't see a language that we support, and know the translations that you want, you can email support@growsurf.com, and we'll provide you with a file of words that you can translate.