We've just rolled out our Multiple Languages feature to all premium plan users. This feature allows you to build one campaign, and serve that campaign in several different languages at one time.
To use this feature, simply hover your campaign and go to Options > Add Language. Please note: you cannot run an A/B tests and use the Multiple Language feature on the same campaign.
Once you begin adding languages to a campaign, they will appear in your dashboard below your original campaign:
From the user side, they would see:
And finally, when switching languages:
This feature allows you to do a lot of nifty things as well, like having separate images for each language, and even sending email notifications in different languages.