This is only valid for single-language website – for multiple language websites, see here]
You can access this option in the “Customize the widget” section of your account.
We consciously choose not to display the language of the widget based on the language of the visitors’ browsers for obvious user experience reasons.
At this stage, the widget is available in 33 languages : English, French, Dutch, Italian, German, Spanish, Portuguese, Russian, Polish, Arabic, Turkish, hindi, Chinese, Japanese, etc.
All the reports are in English.
This video explains you how to customize the survey module: