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In A11yJSON, you can localize all human-readable strings using JSON objects with IETF language tags as property names and the translations as property values:

  "en": "Accessibility",
  "de": "Zugänglichkeit",
  "zh-Hans": "无障碍",
  "ase": ""

This is optional - the specification allows to use a string, too.

We encourage you to localize your strings—If available, you can even use IETF sign language tags (like ase for American Sign Language) for adding sign language localization using video, image or website URLs.