[Bug] firstWeekContainsDate prop not working

[bvidalneofox]

Vue2-datepicker version: [email protected]
Vue version: [email protected]
Browser: Chrome

Steps to reproduce
Set lang prop with a firstWeekContainsDate property:
<date-picker type="week" :lang="langObject"></date-picker>
formatLocale: { firstDayOfWeek: 1, firstWeekContainsDate: 1, }

If i change the firstWeekContainsDate nothing happens. In Vue 2 version works perfect

Reproduction Link or Source Code
https://codepen.io/bvidalneofox/pen/BaqmYLa

Expected behavior
Set the first week in the expected day

Actual behavior
First week not changes