Best answer by Laura
Here's the response that our Localization Program Manager provided:
Hello! Android/iOS app languages are automatically set to follow the device language. I'm not aware of an app setting that can change this at this time.
To change the web interface language setting, please see this article: https://learner.coursera.help/hc/en-us/articles/208279576-Change-your-Coursera-account-settings