The reference to the API you are referring to is not the same as what you use in your code example.
I believe that you are looking for this API , which makes me wonder how the above returns any restuls, since it expects bounds , not latLng , and also does not support the language key.
However, in order to get the results in another language, you can change the way your google script maps are included in accordance with this section of the documents , thus
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false&language=ja"></script>
On the other hand, if you really work with the Geocoding API (web service) , then your URL requests should look something like this (change json to xml, if you want xml to go out and change en to whatever language you want)
http:
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