Truncate long label names

app/assets/stylesheets/pages/labels.scss

@@ -280,7 +280,7 @@
     width: 150px;
     flex-shrink: 0;
 
-    .label {
+    .badge {
       overflow: hidden;
       text-overflow: ellipsis;
       max-width: 100%;

app/views/shared/boards/components/sidebar/_labels.html.haml

@@ -9,7 +9,7 @@
       None
     %a{ href: "#",
       "v-for" => "label in issue.labels" }
-      %span.badge.color-label.has-tooltip{ ":style" => "{ backgroundColor: label.color, color: label.textColor }" }
+      .badge.color-label.has-tooltip{ ":style" => "{ backgroundColor: label.color, color: label.textColor }" }
         {{ label.title }}
   - if can_admin_issue?
     .selectbox