[Feature Request] The calendar firstDayOfWeek should respect locale

[tlouisse]

Currently, our first day of the week is always 0 (a Sunday).

Although firstDayOfWeek is a configurable option on LionCalendar, we might want to make it locale dependent, so that it is Sunday/Monday/some other day dependent on locale.

See:
https://github.com/unicode-cldr/cldr-core/blob/35.0.0/supplemental/weekData.json#L60
tc39/ecma402#6 (comment)

In order to achieve this, we could consider a key/value store inside localize

[jorenbroekema]

Closing as enhancements with votes needed. Our workflow with enhancements is that we close them and have people vote on them, then we sort our enhancements by most votes to see which ones should be prioritized: https://github.com/ing-bank/lion/issues?q=is%3Aissue+is%3Aclosed+label%3Aenhancement+sort%3Areactions-%2B1-desc