Update message list when a message is archived, refs T450

Summary:
 - Call fetch on the model after a success archive or unarchive action.
 - Change `Archive` label to `Move to Inbox` after a message has been archived.

Test Plan:
 - Go to #messages
 - Click on `Archive` to archive the message
 - See the page refresh and `Archive` link change to `Move to Inbox`

Reviewers: rjmackay, shadowhand

Reviewed By: shadowhand

Subscribers: srutto, lkamau

Maniphest Tasks: T452

Differential Revision: https://phabricator.ushahidi.com/D229