Use keyboard API to detect the layout

[mattgodbolt]

See https://developer.mozilla.org/en-US/docs/Web/API/Navigator/keyboard

can improve

jsbeeb/utils.js

Lines 379 to 391 in c0735c2

	function detectKeyboardLayout() {
	if (exports.runningInNode) {
	return "UK";
	}
	if (localStorage.keyboardLayout) {
	return localStorage.keyboardLayout === "US" ? "US" : "UK";
	}
	if (navigator.language) {
	if (navigator.language.toLowerCase() === "en-gb") return "UK";
	if (navigator.language.toLowerCase() === "en-us") return "US";
	}
	return "UK"; // Default guess of UK
	}

with this