The array of language codes, which are valid authoritative label language.

The authoritative labels of all valid language codes. In the first dimension, the object is indexed by the language code. In the second dimension, the object is indexed by the authoritative label language. In the third dimension, the array consists of the authoritative labels of the language code in the authoritative label language.

The array of all valid language codes. This array contains only the two-letter language codes defined in ISO 3166-1 with lower case.

The date when the data were last updated. In other words, this date means the version of the data. Note that the time part of this object is mostly meaningless.