Unfortunately, you can't change the language of a survey.
Freecash doesn't control survey content.
Surveys you see on Freecash are created by our Survey Partners to gather specific feedback. This means the Surveys might be tailored to a particular group of people, based on things such as:
Age
Education
Location
Income
Etc.
Language is also part of this targeting. If a survey is in a language you don't understand, it's likely not intended for you.