app/views/admin/import.html.erb
<p class="active_admin_import_hint">
<%= raw(@active_admin_import_model.hint) %>
</p>
<%= semantic_form_for @active_admin_import_model, url: {action: :do_import}, html: {multipart: true} do |f| %>
<%= f.inputs name: t("active_admin_import.details") do %>
<%= f.input :file, as: :file %>
<% end %>
<%= f.actions do %>
<%= f.action :submit, label: t("active_admin_import.import_btn"), button_html: {data: {disable_with: t("active_admin_import.import_btn_disabled")}} %>
<% end %>
<% end %>