Hi there @KATARIINA, nice to have you here in the Fitbit Community, welcome aboard! I was reading language of your Fitbit app is in Spanish. The app takes the language configuration of your phone settings, so make sure the language of your phone is in English.
Also other factor that can cause this issue, is that there is not a direct support of Sweden (English) in the app language. So try to change to English US and see if the app display the language correctly. It is not require to change the language of your Fitbit.com Dashboard for this purpose.
If the issue persists try to uninstall the app and reinstall it gain in order for the app assimilate the language configuration of your phone and shows English as default. I tried to replicate the issue with my phone and I was able to see the app in English despite my settings were different.
Keep me posted how it goes. I'll be around!
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