Teamwork task: Staged payment metadata and activity feed items not showing correctly

Steps to reproduce

1. Create a Staged payment action.
2. Navigate to the activity feed page and view the newly created Staged payment.
3. Note that the activity feed metadata shows incorrectly.

Expected behaviour

• The metadata line in the action and activity feed should following the spec in the format:
  Staged Payment of {token_amount} {token_symbol} to {recipient_username} with {number_of_milestones} milestones by {creator_username}
• For multiple token types:
  Staged Payment with {number_of_token_types} tokens to {recipient_username} with {number_of_milestones} milestones by {creator_username}

Actual behaviour

• Staged payment metadata and activity feed items not showing correctly, in the action it just shows as the initial version, in the activity feed it displays as if it is a standard Advanced payment.