app/views/ckeditor/shared/_asset_tmpl.html.erb
<script id="fileupload_tmpl" type="text/x-jquery-tmpl">
<div id="asset_${id}" class="gal-item" data-url="${url_content}">
<%= link_to '', "/ckeditor/${controller}/${id}.json",
remote: true,
method: :delete,
title: I18n.t('ckeditor.buttons.delete'),
data: { confirm: t('ckeditor.confirm_delete') },
class: "fileupload-cancel gal-del" %>
<div class="fileupload-file gal-inner-holder">
<div class="img"><img src="${url_thumb}" title="${filename}"></div>
<div class="img-data">
<div class="img-name">${filename}</div>
<div class="time-size">
<div class="time">${format_created_at}</div>
<div class="fileupload-size size">${size}</div>
</div>
</div>
</div>
</div>
</script>