Pass the locale to Electron later

src/main.js

@@ -99,6 +99,18 @@ if (locale) {
 	nlsConfigurationPromise = getNLSConfiguration(product.commit, userDataPath, metaDataFile, locale);
 }
 
+if (product.quality === 'insider' || product.quality === 'exploration') {
+	// Pass in the locale to Electron so that the
+	// Windows Control Overlay is rendered correctly on Windows,
+	// and so that the traffic lights are rendered properly
+	// on macOS when using a custom titlebar.
+	// If the locale is `qps-ploc`, the Microsoft
+	// Pseudo Language Language Pack is being used.
+	// In that case, use `en` as the Electron locale.
+	const electronLocale = (!locale || locale === 'qps-ploc') ? 'en' : locale;
+	app.commandLine.appendSwitch('lang', electronLocale);
+}
+
 // Load our code once ready
 app.once('ready', function () {
 	if (args['trace']) {
@@ -157,9 +169,6 @@ function configureCommandlineSwitchesSync(cliArgs) {
 
 		// override for the color profile to use
 		'force-color-profile',
-
-		// locale for Electron to use
-		'locale'
 	];
 
 	if (process.platform === 'linux') {
@@ -180,8 +189,6 @@ function configureCommandlineSwitchesSync(cliArgs) {
 	// Read argv config
 	const argvConfig = readArgvConfigSync();
 
-	let hasLocaleSwitch = false;
-	const isInsiderOrExploration = product.quality === 'insider' || product.quality === 'exploration';
 	Object.keys(argvConfig).forEach(argvKey => {
 		const argvValue = argvConfig[argvKey];
 
@@ -195,21 +202,6 @@ function configureCommandlineSwitchesSync(cliArgs) {
 				}
 			}
 
-			// Locale
-			else if (argvKey === 'locale') {
-				if (isInsiderOrExploration) {
-					// Pass in the locale to Electron so that the
-					// Windows Control Overlay is rendered correctly.
-					// If the locale is `qps-ploc`, the Microsoft
-					// Pseudo Language Language Pack is being used.
-					// In that case, use `en` as the Electron locale.
-					const localeToUse = (!argvValue || argvValue === 'qps-ploc') ?
-						'en' : argvValue;
-					app.commandLine.appendSwitch('lang', localeToUse);
-					hasLocaleSwitch = true;
-				}
-			}
-
 			// Others
 			else if (argvValue === true || argvValue === 'true') {
 				if (argvKey === 'disable-hardware-acceleration') {
@@ -240,11 +232,6 @@ function configureCommandlineSwitchesSync(cliArgs) {
 		}
 	});
 
-	if (!hasLocaleSwitch && isInsiderOrExploration) {
-		// Default Electron's locale to English
-		app.commandLine.appendSwitch('lang', 'en');
-	}
-
 	/* Following features are disabled from the runtime.
 	 * `CalculateNativeWinOcclusion` - Disable native window occlusion tracker,
 	 *	Refs https://groups.google.com/a/chromium.org/g/embedder-dev/c/ZF3uHHyWLKw/m/VDN2hDXMAAAJ