whoops, used font awesome 3.2 styles :(

app/assets/javascripts/admin/templates/dashboard.js.handlebars

@@ -58,7 +58,7 @@
   <div class="dashboard-stats totals">
     <table>
       <tr>
-        <td class="title"><i class='fa icon-shield'></i> {{i18n admin.dashboard.admins}}</td>
+        <td class="title"><i class='fa fa-shield'></i> {{i18n admin.dashboard.admins}}</td>
         <td class="value">{{#link-to 'adminUsersList.admins'}}{{admins}}{{/link-to}}</td>
         <td class="title"><i class='fa fa-ban'></i> {{i18n admin.dashboard.suspended}}</td>
         <td class="value">{{#link-to 'adminUsersList.suspended'}}{{suspended}}{{/link-to}}</td>

app/assets/javascripts/admin/templates/user_index.js.handlebars

@@ -199,13 +199,13 @@
     <div class='controls'>
       {{#if can_revoke_admin}}
         <button class='btn' {{action revokeAdmin target="content"}}>
-          <i class='fa icon-shield'></i>
+          <i class='fa fa-shield'></i>
           {{i18n admin.user.revoke_admin}}
         </button>
       {{/if}}
       {{#if can_grant_admin}}
         <button class='btn' {{action grantAdmin target="content"}}>
-          <i class='fa icon-shield'></i>
+          <i class='fa fa-shield'></i>
           {{i18n admin.user.grant_admin}}
         </button>
       {{/if}}

app/assets/javascripts/admin/templates/users_list.js.handlebars

@@ -86,7 +86,7 @@
             </td>
             {{/if}}
             <td>
-              {{#if admin}}<i class="fa icon-shield" title="{{i18n admin.title}}"></i>{{/if}}
+              {{#if admin}}<i class="fa fa-shield" title="{{i18n admin.title}}"></i>{{/if}}
               {{#if moderator}}<i class="fa fa-magic" title="{{i18n admin.moderator}}"></i>{{/if}}
             <td>
           </tr>