app/views/search_results/sections/_klass.html.erb
<div class="form-group">
<%= label_tag 't', t('txt.views.search_results.for') %>
<select name="t" id="t" class="form-control">
<%= options_for_select(Iqvoc.searchable_class_names.map { |klass, identifier|
[klass.constantize.model_name.human(:count => 2), identifier]
}, params[:t]) %>
</select>
</div>