discourse/app/views/users/activate_account.html.erb

<div id='simple-container'>
    <h2><%= t 'activation.welcome_to', site_name: SiteSetting.title %></h2>
    <br/>
    <button class='btn btn-primary' id='activate-account-button'><%= t 'activation.action' %></button>

    <%= form_tag(perform_activate_account_path, method: :put, id: 'activate-account-form') do %>
      <%= hidden_field_tag 'password_confirmation' %>
      <%= hidden_field_tag 'challenge' %>
    <% end %>
</div>

<%- content_for(:no_ember_head) do %>
  <%= preload_script "ember_jquery" %>
  <%= preload_script "vendor" %>
  <%= render_google_universal_analytics_code %>
  <%= tag.meta id: 'data-activate-account', data: { path: path('/u/hp') } %>
<%- end %>

<%= preload_script "activate-account" %>