build/lib/policies.ts/getSpecificNLS
async function getSpecificNLS(resourceUrlTemplate: string, languageId: string, version: Version) {
	const resource = {
		publisher: 'ms-ceintl',
		name: `vscode-language-pack-${languageId}`,
		version: `${version[0]}.${version[1]}.${version[2]}`,
		path: 'extension/translations/main.i18n.json'
	};

	const url = resourceUrlTemplate.replace(/\{([^}]+)\}/g, (_, key) => resource[key as keyof typeof resource]);
	const res = await fetch(url);

	if (res.status !== 200) {
		throw new Error(`[${res.status}] Error downloading language pack ${languageId}@${version}`);
	}

	const { contents: result } = await res.json() as { contents: LanguageTranslations };
	return result;
}