pundit: convert tags to pundit.

app/views/tags/edit.html.erb

@@ -9,7 +9,7 @@
         <%= f.input :category, :collection => TagCategory.canonical_mapping.to_a, :include_blank => false %>
       <% end %>
 
-      <% if CurrentUser.is_moderator? %>
+      <% if policy(@tag).can_lock? %>
         <%= f.input :is_locked, :collection => [["No", "false"], ["Yes", "true"]], :include_blank => false %>
       <% end %>
 

app/views/tags/index.html.erb

@@ -16,7 +16,9 @@
         <% end %>
       <% end %>
       <% t.column column: "control" do |tag| %>
-        <%= link_to_if tag.editable_by?(CurrentUser.user), "Edit", edit_tag_path(tag) %> |
+        <% if policy(tag).update? %>
+          <%= link_to "Edit", edit_tag_path(tag) %> |
+        <% end %>
         <%= link_to "History", post_versions_path(search: { changed_tags: tag.name }) %> |
         <%= link_to "Related", related_tag_path(search: { query: tag.name }) %> |
         <%= link_to "Similar", tags_path(search: { fuzzy_name_matches: tag.name, order: :similarity }) %>