remove double icons in the wiki sidebar

lms/static/sass/course/wiki/_wiki.scss

@@ -325,6 +325,10 @@ section.wiki {
         background: url(../images/wiki-icons.png) no-repeat;
       }
 
+      [class^="icon-"] {
+        padding-right: ($baseline/4);
+      }
+
       .icon-view,
       .icon-home {
         background-position: 0 0;

lms/templates/wiki/includes/article_menu.html

@@ -7,7 +7,7 @@
 
 <li class="${"active" if selected_tab == "view" else ""}">
   <a href="${reverse('wiki:get', kwargs={'article_id' : article.id, 'path' : urlpath.path})}">
-    <span class="icon-home icon"></span>
+    <i class="icon-eye-open"></i>
     ${_("View")}
     ${_("{span_start}(active){span_end}").format(span_start="<span class='sr'>", span_end="</span>") if selected_tab == "view" else ""}
   </a>
@@ -16,7 +16,7 @@
 %if article.can_write(user):
   <li class="${"active" if selected_tab == "edit" else ""}">
     <a href="${reverse('wiki:edit', kwargs={'article_id' : article.id, 'path' : urlpath.path})}">
-      <span class="icon-edit icon"></span>
+      <i class="icon-pencil"></i>
       ${_("Edit")}
       ${_("{span_start}(active){span_end}").format(span_start="<span class='sr'>", span_end="</span>") if selected_tab == "edit" else ""}
     </a>
@@ -25,7 +25,7 @@
 
 <li class="${"active" if selected_tab == "history" else ""}">
   <a href="${reverse('wiki:history', kwargs={'article_id' : article.id, 'path' : urlpath.path})}">
-    <span class="icon-changes icon"></span>
+    <i class="icon-time"></i>
     ${_("Changes")}
     ${_("{span_start}(active){span_end}").format(span_start="<span class='sr'>", span_end="</span>") if selected_tab == "history" else ""}
   </a>
@@ -35,7 +35,7 @@
   %if hasattr(plugin, "article_tab"):
     <li class="${"active" if selected_tab == plugin.slug else ""}">
       <a href="${reverse('wiki:plugin', kwargs={'slug' : plugin.slug, 'article_id' : article.id, 'path' : urlpath.path}) }">
-        <span class="${plugin.article_tab[1]} icon"></span>
+        <i class="icon-file ${plugin.article_tab[1]}"></i>
         ${plugin.article_tab[0]}
         ${_("{span_start}(active){span_end}").format(span_start="<span class='sr'>", span_end="</span>") if selected_tab == plugin.slug else ""}
       </a>
@@ -51,7 +51,7 @@ ${_("This should be enabled for all non-anonymous users once the notifications a
 %if can_change_permissions(article,user):
 <li class="${"active" if selected_tab == "settings" else ""}">
   <a href="${reverse('wiki:settings', kwargs={'article_id' : article.id, 'path' : urlpath.path})}">
-    <span class="icon-settings icon"></span>
+    <i class="icon-cog"></i>
     ${_("Settings")}
     ${_("{span_start}active{span_end}").format(span_start="<span class='sr'>(", span_end=")</span>") if selected_tab == "settings" else ""}
   </a>