Add Mailchimp language preference to that user and keep in sync

[alexanmtz]

When a user is created, we add this user to a Mailchimp list, so we should send the user preference of language and update when this user updates their preferences.

Why

When we need to send a campaign to different markets based on user preferences.

Level

Beginner

Useful links

• https://mailchimp.com/developer/

How to reproduce the user scenario

• Create a user - should add to the MailChimp list with the right language preference
• Update user preferences - should update that user language preference

What you will need to complete this issue

Mailchimp keys that will be sent when you're assigned.

Tips

Use our functional test structure to create automated tests for this.

[iamfortune]

hi, ready to do this

[alexanmtz]

Hello @iamfortune, you're now assigned and you can start to work on this issue 👍

[alexanmtz]

We will move out from Mailchimp because it's too expensive for us