use existing class for btn-link buttons

app/assets/javascripts/boards/components/labels_select.vue

@@ -54,13 +54,13 @@ export default {
   <div class="block labels">
     <div class="title append-bottom-10">
       Labels
-      <a
+      <button
         v-if="canEdit"
-        class="edit-link pull-right"
-        href="#"
+        type="button"
+        class="edit-link btn btn-blank pull-right"
       >
         Edit
-      </a>
+      </button>
     </div>
     <div class="value issuable-show-labels">
       <span

app/assets/javascripts/boards/components/milestone_select.vue

@@ -71,13 +71,13 @@ export default {
   <div class="block milestone">
     <div class="title append-bottom-10">
       Milestone
-      <a
+      <button
         v-if="canEdit"
-        class="edit-link pull-right"
-        href="#"
+        type="button"
+        class="edit-link btn btn-blank pull-right"
       >
         Edit
-      </a>
+      </button>
     </div>
     <div
       class="value"

app/assets/javascripts/boards/components/user_select.vue

@@ -95,13 +95,13 @@ export default {
   >
     <div class="title append-bottom-10">
       {{ label }}
-      <a
+      <button
         v-if="canEdit"
-        class="js-sidebar-dropdown-toggle edit-link pull-right"
-        href="#"
+        type="button"
+        class="edit-link btn btn-blank pull-right"
       >
         Edit
-      </a>
+      </button>
     </div>
     <div class="value">
       <div

app/assets/javascripts/boards/components/weight_select.vue

@@ -74,13 +74,13 @@ export default {
   <div class="block weight">
     <div class="title append-bottom-10">
       Weight
-      <a
+      <button
         v-if="canEdit"
-        class="edit-link pull-right"
-        href="#"
+        type="button"
+        class="edit-link btn btn-blank pull-right"
       >
         Edit
-      </a>
+      </button>
     </div>
     <div
       class="value"

app/assets/stylesheets/framework/typography.scss

@@ -305,16 +305,6 @@ h6 {
   font-weight: $gl-font-weight-bold;
 }
 
-.edit-link {
-  color: $gl-text-color;
-
-  &:focus,
-  &:hover {
-    color: $gl-text-color;
-    text-decoration: none;
-  }
-}
-
 .light-header {
   font-weight: $gl-font-weight-bold;
 }