src/vs/workbench/contrib/localization/browser/localeService.ts/WebLocaleService/clearLocalePreference
class WebLocaleService:	async clearLocalePreference(): Promise<void> {
		window.localStorage.removeItem('vscode.nls.locale');

		if (Language.value() === navigator.language) {
			return;
		}

		const restartDialog = await this.dialogService.confirm({
			type: 'info',
			message: localize('clearDisplayLanguageMessage', "To change the display language, {0} needs to reload", this.productService.nameLong),
			detail: localize('clearDisplayLanguageDetail', "Press the reload button to refresh the page and use your browser's language."),
			primaryButton: localize({ key: 'reload', comment: ['&& denotes a mnemonic character'] }, "&&Reload"),
		});

		if (restartDialog.confirmed) {
			this.hostService.restart();
		}
	}