UC: Updating a lesson: moving the slot
UC: Admin page
UC: Account admin: HTTP call to get the list of accounts
UC: Account admin: back button
UC: Account admin: list of accounts as a resource
UC: Account admin: accounts with verified & disabled flags
UC: Account admin: list of accounts
UC: Deleting an account: button
UC: Deleting an account: confirmation code
UC: Deleting an account: service layer