This is not the final website. It is a demo of the real tool working, made for Y Combinator.
AxisRemedy

11-002 Natural language for text in Alt, ActualText and E attributes cannot be determined.

The language of Alt, ActualText or E text cannot be determined.

Checkpoint
11: Declared Natural Language
ISO 14289-1 (PDF/UA-1) clause
7.2-3
Test type in the protocol
Machine-testable
Applies to
A single object

How AxisRemedy handles it

Tested by the app. AxisRemedy tests this condition itself. For each document it records passed, failed or not applicable, and for every failure the object and the page.

What the check covers

Decided from /Lang on the element, its ancestors or the catalog; a language escape inside the text counts.