DatePickerInput and DatePicker don't update the locale

[FrancescoCioria]

description

If you pass first a locale X and then, without unmounting, a locale Y, DatePickerInput and DatePicker don't update the locale.

how to reproduce

• pass locale en
• pass locale it without unmounting
• still using old locale en

specs

add some logic in componentWillReceiveProps to keep moment.locale in sync with props.locale

misc

{optional: other useful info}