You can change the language of the TM app at any time from your account settings.
If you want to change video subtitle settings, see How do I turn on video subtitles?
In the Transcend or Profile section, tap the gear icon in the top right corner.
Scroll down to Account settings, then tap Language.
Choose your preferred language.
The app will update to the selected language automatically.
Currently, the TM app is available in English and Spanish. More languages will become available in the future.