Lingua.language_for_iso_code

You're seeing just the function language_for_iso_code, go back to Lingua module for more information.
Link to this function

language_for_iso_code(code)

Get the language for the given ISO 639-1 or 639-3 language code.

Example

iex> Lingua.language_for_iso_code(:en)
{:ok, :english}
iex> Lingua.language_for_iso_code(:eng)
{:ok, :english}
iex> Lingua.language_for_iso_code(:mop)
{:error, :unrecognized_iso_code}