Why does this happen?
Parts of the app have already been translated into Spanish, but some interface elements (UI) and certain courses are still displayed in English.
Audio tracks are also in the process of localization, so some may currently play in English.
When will the full localization be ready?
Work on the Spanish version is ongoing.
Future updates will gradually include more translated interface elements and course content.
Summary
If you see parts of the app still in English, this is normal for the current version. A complete Spanish experience will become available in upcoming updates.