Add ability to delete Maybe account (#698)

* Build out user deactivation and purging workflows

* Add i18n translations for user deletion

* Add tests for user deletion

* Fix lint issue

config/locales/views/shared/en.yml

@@ -4,6 +4,7 @@ en:
     confirm_modal:
       accept: Confirm
       body_html: "<p>You will not be able to undo this decision</p>"
+      cancel: Cancel
       title: Are you sure?
     notification:
       dismiss: Dismiss