src/vs/workbench/api/common/extHostLocalizationService.ts/ExtHostLocalizationService/getMessage
class ExtHostLocalizationService:	getMessage(extensionId: string, details: IStringDetails): string {
		const { message, args, comment } = details;
		if (this.isDefaultLanguage) {
			return format2(message, (args ?? {}));
		}

		let key = message;
		if (comment && comment.length > 0) {
			key += `/${Array.isArray(comment) ? comment.join() : comment}`;
		}
		const str = this.bundleCache.get(extensionId)?.contents[key];
		if (!str) {
			this.logService.warn(`Using default string since no string found in i18n bundle that has the key: ${key}`);
		}
		return format2(str ?? message, (args ?? {}));
	}