Manifest files can be used to retrieve localized variations of image alt text from Content Hub. The Automatic alt text service must be set up for the hub.
Alt text has localized variations which can be retrieved, along with a default description that will be returned by default if no locale is provided:
$asset.getAltText()
To retrieve a localized version of the alt text, a locale can be supplied:
$asset.getAltText('fr-FR')
More about using Manifests to retrieve localized image alt text.