Hi There,
Thanks for writing in! Yes, you can place the icon before or after the button label.
e.g.
[x_button size="global" block="false" circle="false" icon_only="false" href="#" title="" target="" info="none" info_place="top" info_trigger="hover" info_content=""]Click Me![x_icon type="angellist" class="mvn mls mrn"][/x_button]
Even the button element has an option for that.
http://prntscr.com/d5ujj9
Cheers!