Datepicker doesn't use locale if user write date in input

[rbleuse]

Bug, feature request, or proposal:

The datepicker component doesn't use locale if the user writes the date directly in the input, without choosing date from calendar popup

What is the expected behavior?

The date should be parsed with the locale set up in module

What is the current behavior?

The date uses the default locale

What are the steps to reproduce?

Here is a stackblitz with french locale :
https://stackblitz.com/edit/angular-material2-issue-rb6xvc?file=app/app.component.ts

Select a date from the calendar in the first datepicker
Validate first date picker
Then copy paste the date in the second
Validate the second date picker

If you choose 01/02/2018 (1st of february), you get these result :
first : Thu Feb 01 2018 00:00:00 GMT+0100 (Paris, Madrid)
second : Tue Jan 02 2018 00:00:00 GMT+0100 (Paris, Madrid)

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

ng 5.1 / material2 5.0.0

Is there anything else we should know?

[NaifousBS]

See #7823

Also a stackblitz example with the french locale : https://stackblitz.com/edit/angular-date-picker-sample-fr?file=app%2Fmoment-date-adapter.ts

Edit: adding stackblitz example

[rbleuse]

Yes it works great. Thank you !

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