src/vs/platform/languagePacks/node/languagePacks.ts/NativeLanguagePackService/getInstalledLanguages
class NativeLanguagePackService:	async getInstalledLanguages(): Promise<Array<ILanguagePackItem>> {
		const languagePacks = await this.cache.getLanguagePacks();
		const languages = Object.keys(languagePacks).map(locale => {
			const languagePack = languagePacks[locale];
			const baseQuickPick = this.createQuickPickItem({ locale, label: languagePack.label });
			return {
				...baseQuickPick,
				extensionId: languagePack.extensions[0].extensionIdentifier.id,
			};
		});
		languages.push({
			...this.createQuickPickItem({ locale: 'en', label: 'English' }),
			extensionId: 'default',
		});
		return languages;
	}