Extract registrar controller translations in admin area

#279

app/views/admin/registrars/_form.haml

@@ -75,7 +75,7 @@
     .col-md-8
       .panel.panel-default
         .panel-heading.clearfix
-          .pull-left= t(:misc)
+          .pull-left= t('.misc')
         .panel-body
           .form-group
             .col-md-4.control-label
@@ -91,4 +91,4 @@
   %hr
   .row
     .col-md-8.text-right
-      = button_tag(t(:save), class: 'btn btn-primary')
+      = button_tag(t(".#{f.object.new_record? ? 'create' : 'update'}_btn"), class: 'btn btn-success')

app/views/admin/registrars/index.haml

@@ -1,5 +1,5 @@
 - content_for :actions do
-  = link_to(t(:new), new_admin_registrar_path, class: 'btn btn-primary')
+  = link_to(t('.new_btn'), new_admin_registrar_path, class: 'btn btn-primary')
 = render 'shared/title', name: t(:registrars)
 
 .row