Level 1 Success Criterion for Guideline 3.1:
The natural language of each foreign passage or phrase in the content can be programmatically determined.

Glossary

foreign passage or phrase
Foreign passages or phrases are passages or phrases in a language that is different from the language of the surrounding text.
natural language
Natural languages are those used by humans to communicate, including spoken, written, and signed languages.
programmatically determined
Programmatically determined means that the specific value can be determined in a standard, machine or software readable form.