I’m not sure if this will help, but here goes. I see two different areas on SmartController to adjust languages, first is in settings itself second is the app to fly.
Will attach pictures for both methods, hope this helps.
1. Stroll down and select (LANGUAGES & INPUT)
2 Then Select (LANGUAGES)
3. Check your primary language, mine is on English. i think you can add a language.
Next method, directly in the Controller app.
1. Select ( General)
2. Then select (Select Language)
3. Primary language should be on English, if not select English. A check mark will attach itself to the primary language selected.