Alternatively, in the languages I speak:
Welche Sprachen sprechen Sie? (Deutsch/German)
¿Qué idiomas habla usted? (Español/Spanish)
Que langue fait-vous parlez? (Français/French)
EDIT: There, I think I fixed the sentences.
Alternatively, in the languages I speak:
Welche Sprachen sprechen Sie? (Deutsch/German)
¿Qué idiomas habla usted? (Español/Spanish)
Que langue fait-vous parlez? (Français/French)
EDIT: There, I think I fixed the sentences.
No, it is odd to use the singular imho. Of course it is not the polite form
Eg: https://www.reddit.com/r/france/comments/6ocn38/quelles_langues_étrangères_parlez_vous/