Add missing loading indicator throbbers.

r2/r2/public/static/css/reddit.less

@@ -5176,6 +5176,10 @@ table.calendar {
             .light-button;
             padding: 3px 4px;
         }
+
+        .throbber {
+            height: 22px;
+        }
     }
 
     form.copy-multi button {

r2/r2/templates/multiinfobar.html

@@ -56,6 +56,7 @@
   %if thing.can_copy:
     <form class="copy-multi">
       <input type="text" class="multi-name" placeholder="${_('copy name')}"><button class="copy">${_('copy')} &rsaquo;</button>
+      <div class="throbber"></div>
       <div class="error copy-error"></div>
     </form>
   %endif
@@ -64,6 +65,7 @@
     <form class="rename-multi">
       <p class="warning">${_('warning: renaming a multi will break any links and references to the old name.')}</p>
       <input type="text" class="multi-name" placeholder="${_('new name')}"><button class="rename">${_('rename')} &rsaquo;</button>
+      <div class="throbber"></div>
       <div class="error rename-error"></div>
     </form>
   %endif