Improve admin area button style

app/views/admin/labels/index.html.haml

 - page_title "Labels"
-= link_to new_admin_label_path, class: "pull-right btn btn-new" do
+= link_to new_admin_label_path, class: "pull-right btn btn-nr btn-new" do
   New label
 %h3.page-title
   Labels

app/views/admin/projects/show.html.haml

 - page_title @project.name_with_namespace, "Projects"
 %h3.page-title
   Project: #{@project.name_with_namespace}
-  = link_to edit_project_path(@project), class: "btn pull-right" do
+  = link_to edit_project_path(@project), class: "btn btn-nr pull-right" do
     %i.fa.fa-pencil-square-o
     Edit
 %hr

app/views/admin/users/_head.html.haml

@@ -7,8 +7,8 @@
 
   .pull-right
     - unless @user == current_user || @user.blocked?
-      = link_to 'Impersonate', impersonate_admin_user_path(@user), method: :post, class: "btn btn-grouped btn-info"
-    = link_to edit_admin_user_path(@user), class: "btn btn-grouped" do
+      = link_to 'Impersonate', impersonate_admin_user_path(@user), method: :post, class: "btn btn-nr btn-grouped btn-info"
+    = link_to edit_admin_user_path(@user), class: "btn btn-nr btn-grouped" do
       %i.fa.fa-pencil-square-o
       Edit
 %hr