src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/ExtensionsWorkbenchService/canSetLanguage
class ExtensionsWorkbenchService:	canSetLanguage(extension: IExtension): boolean {
		if (!isWeb) {
			return false;
		}

		if (!extension.gallery) {
			return false;
		}

		const locale = getLocale(extension.gallery);
		if (!locale) {
			return false;
		}

		return true;
	}