1. javascript : maps.google.com ---> maps.google.co.kr
<script type="text/javascript" src="https://maps.google.co.kr/maps/api/js"></script>



2. heatmap : 원래주소 + '&language=ko&region=KR'
2017-08-02 <script async defer src="https://maps.googleapis.com/maps/api/js?libraries=visualization&callback=initMap"></script>

---> https://developers.google.com/maps/documentation/javascript/localization



3. my maps : 원래주소  + '&hl=ko&gl=kr'
google my maps https://www.google.com/maps/d/u/1/edit?mid=1hPYlbyF1b-ZriT5kn1dY1E7qtho&ll=22.42000846977385%2C-176.1998077581619&z=3