Why is it in spanish?? I cannot figure out how to change it to english.
For mobile version, follow the steps in the comment above.
For a navigator addon, i thought it's in English by default and if you saw another languge then something in the parameters has been changed maybe according to your localization.
If this is the first time you say a an unknown language in one of your app, then better to check deeper before using it with your own seed or by depositing to a new seed. There are a lot of fake versions of app sources.