CldrLocale constructor
The locale of the first of tags that CLDR has data for, or the root
locale und if none has.
Each tag is a BCP 47 language tag. Its nu Unicode extension keyword,
as in ar-u-nu-latn, chooses a numeric numbering system, and its hc
keyword is kept as hourCycle.
Implementation
factory CldrLocale(List<String> tags) => CldrLocale._(NumberLocale(tags));