LUT-25169: create an option draft to save the work in progress

Author: TimotheeHrl

webapp/WEB-INF/templates/skin/plugins/wiki/modify_published.html

@@ -12,7 +12,7 @@
             <button id="CancelPublication" name="action_cancelPublication" type="submit" class="btn btn-danger" >#i18n{wiki.modify_page.buttonCancelPublish} </button>
           </form>
           <a class="btn btn-default" href="jsp/site/Portal.jsp?page=wiki&view=page&page_name=${page_name}" title="#i18n{wiki.button.backToPage}">
-            <span class="glyphicon glyphicon-chevron-left"></span> #i18n{wiki.button.backToPage}
+              <span class="fa fa-chevron-left"></span> #i18n{wiki.button.backToPage}
           </a>
         </div>