Support locales that do not have cldr-data by falling back to the minimum locale

[agubler]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code has been formatted with prettier as per the readme code style guidelines
• [x] Unit or Functional tests are included in the PR

Description:

Not all valid locales have cldr-data, therefore if a locale like zh-CN is used then the cldr loader should load the cldr-data for the minimum locale, in this case it would be zh. It should still be loaded by changing locale to zh-CN.

Resolves #252