Android devices :
In Android devices, the app’s language is aligned with your phone’s language setting. If you would like to change the app’s language to your preferred language, please go to your phone’s Settings -> Language and region -> Choose the preferred language. Please note that it is impossible to change the language within the app.
In iOS devices, you are able to set the app’s language preference without changing the system language setting. All you need to do is go to Settings > Whim > Language > select the preferred language (See the pictures below)