shorten settings reset text, add glyph

app/assets/javascripts/admin/templates/site_settings/setting_enum.js.handlebars

@@ -12,6 +12,6 @@
   </div>
 {{else}}
   {{#if overridden}}
-    <button class='btn' href='#' {{action resetDefault this}}>{{i18n admin.site_settings.reset}}</button>
+    <button class='btn' href='#' {{action resetDefault this}}><i class="fa fa-undo"></i>{{i18n admin.site_settings.reset}}</button>
   {{/if}}
 {{/if}}

config/locales/client.en.yml

@@ -1749,7 +1749,7 @@ en:
       site_settings:
         show_overriden: 'Only show overridden'
         title: 'Settings'
-        reset: 'reset to default'
+        reset: 'reset'
         none: 'none'
         no_results: "No results found."
         clear_filter: "Clear"