> [!CAUTION]
> **Important:** Chrome will be removing support for Chrome Apps on all platforms. Chrome browser and the Chrome Web Store will continue to support extensions. [**Read the announcement**](https://blog.chromium.org/2020/08/changes-to-chrome-app-support-timeline.html) and learn more about [**migrating your app**](https://developer.chrome.com/apps/migration).

Specifies the subdirectory of `_locales` that contains the default strings for this extension. This
field is **required** in extensions that have a `_locales` directory; it **must be absent** in
extensions that have no `_locales` directory. For details, see [Internationalization](https://developer.chrome.com/extensions/i18n).