1. A data localization service for a web browser residing on a computing device, comprising: an interpreter in the web browser that executes scripts expressed in a scripting language; a priority handler configured to receive a request to localize data from a requesting client application and provide in response thereto a localized representation of the data to the requesting client application, wherein the priority handler is a script expressed in the scripting language and executed by the interpreter; and a native data localizer configured to receive a request to localize data from the priority handler and localize the data in accordance with a localization preference parameter indicative of a locale, wherein the native data localizer is a function integrated into the interpreter.