Just like you visit maps.google.com.tw or maps.google.co.kr or maps.google.co.jp, you can see their own language shown on every country. I
maps.google.com.tw
maps.google.co.kr
maps.google.co.jp
In Google Maps API v3, add "language" attribute to script tag. For example, the following will set map to display Russian in location names and navigation buttons:
Result: