tracks/app/views/users/_update_password.html.erb

<div class="form-group">
  <label for="user[password]"><%= t('users.new_password_label') %>:</label>
  <%= password_field "user", "password", :size => 40, :autocomplete => "off", class: "form-control" %>
</div>
<div class="form-group">
  <label for="user[password_confirmation]"><%= t('users.password_confirmation_label') %>:</label>
  <%= password_field "user", "password_confirmation", :size => 40, :autocomplete => "off", class: "form-control" %>
</div>