message: Add invite copy
diff: @@ -9,6 +9,10 @@ block content
  .tab-content__frame
  .Narrow
  + p.Type.Type--lh-tall
  + strong Earn 3 free months of Are.na Premium
  + br
  + | Invite 3 friends to join Are.na and get 3 months free a Premium membership when they sign up.
  p.Type.Type--lh-tall
  | Invite as many friends and collaborators to Are.na as you&rsquo;d like.
  | Once the person you invited creates an account, you will automatically be following one another.
  