You can translate field names through the web builder, and translate field values via the fields manager. You can add target languages in the Event dashboard -> Settings -> Languages
Translating field values
You can translate everything about the fields in all the available languages. This includes its label (name of the field displayed to the participants), the placeholder, tooltip, and of course its values (for select fields for example).
To translate your fields, open the field in the Fields manager module -> Translation tab. Add a target language, enable the edit mode, and add the translations.