The language can not be selected or changed in the Carly app directly. The app language is set to the default language you have your phone set to. If you, for example, selected English as a system language, the Carly app would display in English as well.
Currently, we support English, German, French, and Spanish as the app languages. If your app is not displaying in your default language it means we do not support it. Then, the app is automatically displaying in English.
Please note: in French and Spanish, only the menu is translated (no error codes or codings). This will be improved in the future.
Other languages will be also supported in the future.