I live in Mexico and my text messages are sometimes in English and sometimes in Spanish. When I had Android 4.4 and 5.0 it was a mess. When I would try to dictate a message in Spanish Android would type English words that sounded similar. I didn't bother to try with Android 6 or 7. I'm using Android 8 beta now and tried dictating a text with my new Pixel. It works fine in both languages. If I mix Spanish and English in one message it has a nervous breakdown but if I start speaking it seems to correctly identify the language and lock in on it for the message. Thanks, Android.