app/views/conferences/_speech_type_fields.html.erb
<div class="nested-fields">
<div class="input-group">
<%= f.input :type_name_en, label: false, input_html: {class: "form-control required"}, wrapper: false, placeholder: t('speech_types.english') %>
<%= f.input :type_name_tr, label: false, input_html: {class: "form-control required"}, wrapper: false, placeholder: t('speech_types.turkish') %>
<%= f.input :duration, as: :string, label: false, input_html: {class: "form-control required duration"}, wrapper: false, placeholder: t('speech_types.duration') %>
<span class="input-group-btn">
<%= link_to_remove_association t("general.remove"), f, class: "btn btn-danger" %>
</span>
</div>
</div>