How can I display Google Maps API results in a language other than English?

Google Maps Platform APIs below use language parameter to display results in a specific language:

• Maps JavaScript API
• Geocoding API
• Directions API
• Distance Matrix API
• Places API

This an optional parameter that takes in an IETF language code which consists of two or more character code values to represent a language. The API results will be returned in the language specified in the request. Few examples: 

• en: English
• en-GB: English (Great Britain)
• zh-CN: Chinese (Simplified)
• pt-BR: Portuguese (Brazil)
• sw: Swahili

Example usage for Geocode API: 

https://maps.googleapis.com/maps/api/geocode/json?address=Ichiran+Ramen+Shibuya+City+Tokyo+JP&language=ja&key=<YOUR_API_KEY>

Full list of supported languages can be found in Google Maps Platform FAQ > Supported Languages.