fix labels button dropdown not showing how many labels clicked

app/assets/javascripts/labels_select.js.coffee

@@ -220,9 +220,19 @@ class @LabelsSelect
           fields: ['title']
         selectable: true
 
-        toggleLabel: (selected) ->
+        toggleLabel: (selected, el) ->
+          selected_labels = $('.js-label-select').siblings('.dropdown-menu-labels').find('.is-active')
+
           if selected and selected.title?
+            if selected_labels and selected_labels.length > 1
+              "#{selected.title} +#{selected_labels.length - 1} more"
+            else
               selected.title
+          else if not selected and selected_labels.length isnt 0
+            if selected_labels.length > 1
+              "#{$(selected_labels[0]).text()} +#{selected_labels.length - 1} more"
+            else if selected_labels.length is 1
+              $(selected_labels).text()
           else
             defaultLabel
         fieldName: $dropdown.data('field-name')