In HERE Maps, press the menu button on your device and select Settings > Navigation > Voice options.

Standard English (UK) male and Hindi female navigation voices are already included with HERE Maps. Many other languages are available. You won’t hear individual street names, but the navigation will tell you where to turn and when with plenty of advance notice.

If you download a map of a country or region and use drive navigation there, you won't automatically hear voice navigation in a language spoken in that country or region. Navigation voices and downloaded maps behave independently of each other, so you have to set the language you want to hear using the Voice options setting.