Why are we doing this?

All of the users who tested reading list syncing assumed that their saved articles would be available on the web.

Proposed solution

Update the popover text to state that the articles will be synced across 'Wikipedia apps' and not devices

Pop up after a user logs in	Pop up for non-logged in user
Your saved articles and reading lists can now be saved to your Wikipedia account and synced across Wikipedia apps.	Log in or create an account to allow your saved articles and reading lists to saved to your user preferences and synced across Wikipedia apps.