Use icons for feature flag action buttons

app/views/projects/feature_flags/_list.html.haml

@@ -13,11 +13,20 @@
         %li.pages-domain-list-item.unstyled
           = feature_flag.name
 
-          %div.controls.d-none.d-md-block
+          %div.controls.d-flex
             = render 'delete_feature_flag_modal', { feature_flag: feature_flag }
-            = link_to 'Edit', edit_project_feature_flag_path(@project, feature_flag), class: "btn btn-sm btn-grouped"
-            %button.btn.btn-remove.btn-sm.btn-grouped{ type: 'button', data: { toggle: 'modal', target: "#delete-feature-flag-modal-#{feature_flag.id}" } }
-              Remove
+
+            = button_to edit_project_feature_flag_path(@project, feature_flag),
+              class: 'btn btn-default has-tooltip',
+              type: 'button',
+              title: _('Edit') do
+              = sprite_icon('pencil', size: 16)
+
+            %button.btn.btn-danger.has-tooltip.m-0.ml-2{ type: 'button',
+              data: { toggle: 'modal',
+                target: "#delete-feature-flag-modal-#{feature_flag.id}" },
+              title: _('Delete') }
+              = sprite_icon('remove', size: 16)
 
           %p
             - if feature_flag.active?