lost icon

Hello support.
When I have saved the text in 'Responsive Desing' Top-c module, the uk-icon-mobile icon has been lost (as you can see in the image). I could not find where to reset the icon.How can I do to put this icon or other.
best regards

Hi there,
it depends on the Joomla Editor
www.joomlaplates.com/support/documentati...content-was-cleansed

Here is the ssource code of the Icon:

<h3 class="uk-panel-title">Responsive Design</h3>
<span class="uk-icon-mobile-phone uk-icon-large"></span>
<p>A fully responsive layout that adapts perfectly for all device resolutions.</p>