reverting _mr_title.html.haml

app/views/projects/merge_requests/show/_mr_title.html.haml

 .detail-page-header
-  - if @merge_request.merged?
-    .status-box{ class: "status-box-merged" }
-      Merged
-  - else
-    .status-box{ class: "status-box-closed #{merge_request_button_visibility(@merge_request, false)}"}
-      Closed
-    .status-box{ class: "status-box-open #{merge_request_button_visibility(@merge_request, true)}"}
-      Open
+  .status-box{ class: status_box_class(@merge_request) }
+    = @merge_request.state_human_name
   %span.identifier
     Merge Request ##{@merge_request.iid}
   %span.creator
@@ -21,11 +15,11 @@
         = time_ago_with_tooltip(@merge_request.updated_at, placement: 'bottom')
 
   .issue-btn-group.pull-right
-    - if can?(current_user, :update_merge_request, @merge_request) && !@merge_request.merged?
-      
-      = link_to 'Reopen', merge_request_path(@merge_request, merge_request: {state_event: :reopen }, format: 'json'), data: {no_turbolink: true}, method: :put, class: "btn btn-nr btn-grouped btn-reopen reopen-mr-link #{merge_request_button_visibility(@merge_request, false)}", title: 'Reopen merge request'
-      = link_to 'Close', merge_request_path(@merge_request, merge_request: { state_event: :close }, format: 'json'), data: {no_turbolink: true}, method: :put, class: "btn btn-nr btn-grouped btn-close #{merge_request_button_visibility(@merge_request, true)}", title: 'Close merge request'
-
-      = link_to edit_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), class: "btn btn-nr btn-grouped issuable-edit #{merge_request_button_visibility(@merge_request, true)}", id: 'edit_merge_request' do
-        %i.fa.fa-pencil-square-o
-        Edit
\ No newline at end of file
+    - if can?(current_user, :update_merge_request, @merge_request)
+      - if @merge_request.open?
+        = link_to 'Close', merge_request_path(@merge_request, merge_request: { state_event: :close }), method: :put, class: 'btn btn-nr btn-grouped btn-close', title: 'Close merge request'
+        = link_to edit_namespace_project_merge_request_path(@project.namespace, @project, @merge_request), class: 'btn btn-nr btn-grouped issuable-edit', id: 'edit_merge_request' do
+          %i.fa.fa-pencil-square-o
+          Edit
+      - if @merge_request.closed?
+        = link_to 'Reopen', merge_request_path(@merge_request, merge_request: {state_event: :reopen }), method: :put, class: 'btn btn-nr btn-grouped btn-reopen reopen-mr-link', title: 'Reopen merge request'