Deface::Override.new(
  :virtual_path => "spree/admin/users/index",
  :name => "referral_code_header",
  :insert_before => "[data-hook='admin_users_index_headers'] th:nth-child(2)",
  :text => "<th class='align-center'><%= Spree.t(:referrals) %></th>"
)
Deface::Override.new(
  :virtual_path => "spree/admin/users/index",
  :name => "referral_code",
  :insert_before => "[data-hook='admin_users_index_rows'] td:nth-child(2)",
  :text => "<td class='align-center'><%= user.referred_count %></td>"
)
Deface::Override.new(
  :virtual_path => "spree/admin/users/index",
  :name => "column_withds",
  :replace => "#listing_users > colgroup",
  :text => "<col style='width: 75%'><col style='width: 10%'><col style='width: 15%'>"
)

Deface::Override.new(
  :virtual_path => "spree/admin/users/index",
  :name => "referral_code_header",
  :insert_before => "[data-hook='admin_users_index_headers'] th:nth-child(2)",
  :text => "<th class='align-center'><%= Spree.t(:referrals) %></th>"
)
Deface::Override.new(
  :virtual_path => "spree/admin/users/index",
  :name => "referral_code",
  :insert_before => "[data-hook='admin_users_index_rows'] td:nth-child(2)",
  :text => "<td class='align-center'><%= user.referred_count %></td>"
)

Update for new Bootstrap Frontend in Spree 3.0.0.beta
Update for new Bootstrap Frontend in Spree 3.0.0.beta
