The documentation for UI extensions’ localization property gives the impression that the extensionLanguage.isoCode has a value which matches the language whose translation file is being used to present copy to the customer. However, I’ve found that when I have my store’s language as English (not American English), and when my extension only has anen-US.default.json translation file, extensionLanguage.isoCode is the regionless en, not the en-US that the documentation seems to suggest it should be. I’m wondering if this is a bug, or unclear documentation, or something else – any insight into this would be very helpful. Thanks!