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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Maybe start by looking at the differences between your app loader and official one. It works fine even on https://espruino.github.io/BangleApps/ so I imagine something must be different in your version?
Maybe also check in the chrome dev console? Maybe there was an error in the code and so it stopped execution before getting to the point where it updated the language list?