Siri received a major upgrade in iOS 11 with the ability to translate English to French, Spanish, German, Italian and Mandarin Chinese. How do I use this feature on iPhone?
With iOS 11, Siri is ready to translate. Simply ask, "How do you say ___ in (Spanish, Italian, German, French or Chinese)" and Siri will show you the written translation accompanied by an audio translation that you can repeat with the play button. If Siri doesn't quite understand your request, simply tap on your question to edit it with the keyboard.