Update classname for indeterminate state

app/assets/javascripts/labels_select.js.coffee

@@ -205,7 +205,7 @@ class @LabelsSelect
           if $dropdown.hasClass('js-filter-bulk-update')
             indeterminate = instance.indeterminateIds
             if indeterminate.indexOf(label.id) isnt -1
-              selectedClass.push 'indeterminate'
+              selectedClass.push 'is-indeterminate'
 
           if $form.find("input[type='hidden']\
             [name='#{$dropdown.data('fieldName')}']\

app/assets/stylesheets/framework/dropdowns.scss

@@ -232,7 +232,7 @@
   a {
     padding-left: 25px;
 
-    &.indeterminate, &.is-active{
+    &.is-indeterminate, &.is-active{
       &::before {
         position: absolute;
         left: 5px;
@@ -246,7 +246,7 @@
       }
     }
 
-    &.indeterminate::before {
+    &.is-indeterminate::before {
       content: "\f068";
     }