Allow localization of number format #1
Description
The number format right now is US only (thousands separated by comma), but this is not how numbers are formatted in other countries or cultures.
The code should allow for localization of the number, via https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString , with a sensible fallback for older browsers. Locale should ideally fetched from navigator.languages or from a lang attribute in a the map's container or page body, or allow the developer to override that. See https://www.w3.org/TR/html4/struct/dirlang.html#h-8.1 , https://www.w3.org/TR/ltli/