Alternatively, in the languages I speak:
Welche Sprachen sprechen Sie? (Deutsch/German)
¿Qué idiomas habla usted? (Español/Spanish)
Quelle langue parlez-vous? (Français/French)
EDIT: These sentences are now up to date.
English, decent Italian, a handful of words in French and Spanish, fluent piglatin.
Spanish and English. I also know enough Catalan to be able to read but now speak it
German (native), English (not native-level but compared to my work colleagues I might as well be lol) and some American Sign Language (I can carry a simple conversation as long as I may fingerspell words I don’t know yet/anymore)
Spanish, english, german.