Truncate long labels with ellipsis in labels page

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.13.0 (unreleased)
+  - Truncate long labels with ellipsis in labels page
   - Update runner version only when updating contacted_at
   - Add link from system note to compare with previous version
   - Use gitlab-shell v3.6.2 (GIT TRACE logging)

app/assets/stylesheets/pages/labels.scss

@@ -59,6 +59,13 @@
       width: 200px;
       margin-bottom: 0;
     }
+
+    .label {
+      overflow: hidden;
+      text-overflow: ellipsis;
+      vertical-align: middle;
+      max-width: 100%;
+    }    
   }
 
   .label-description {