aardbei/app/views/activities/mass_new.htm...

.container
  %h1
    = t 'activities.mass_import', group: @group.name
  .row
    .col-md-12
      %p
        = t 'activities.mass_import_explanation'
      = link_to asset_path('batch_activities.csv'), class: 'btn btn-default' do
        = t :download
  .row
    .col-md-12
      = form_tag(group_activities_mass_new_path(@group), method: 'post', multipart: true) do
        .form-group
          = file_field_tag 'spreadsheet', required: true
        .form-group
          = submit_tag("Go!", class: 'btn btn-warning', confirm: t(:areyousure))