Following #14998, reorder the locale segments to `language`, `script`,
`region` to match the standard format. This does not require changes
outside the `Locale` class because `Locale` instances are always
constructed with the `parse` method.
Signed-off-by: Ruoyu Zhong <zhongruoyu@outlook.com>
- For some of these I changed `context` to `describe` as it fit better
rather than contriving a "when", "with" or "without", or massively
restructuring the tests.
