diff --git a/app/models/user.rb b/app/models/user.rb
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -91,7 +91,7 @@
   end
 
   def has_role?(role)
-    self.roles.where(name: role).count > 0
+    self.roles.where(name: [role,'admin']).count > 0
   end
 
   def email_for_editing
diff --git a/app/views/report/_task_hof.html.haml b/app/views/report/_task_hof.html.haml
--- a/app/views/report/_task_hof.html.haml
+++ b/app/views/report/_task_hof.html.haml
@@ -54,12 +54,14 @@
         %table.table.table-hover
           %thead
             %tr
-              %th #Sub
+              %th #Sub (lang)
               %th Author
           %tbody
             - @model_subs.each do |sub|
               %tr
-                %td= link_to "##{sub.id}", submission_path(sub)
+                %td
+                  = link_to "##{sub.id}", submission_path(sub)
+                  = "(#{sub.language.pretty_name})"
                 %td= sub.user.full_name
     .col-md-8
       - if @best
diff --git a/app/views/report/problem_hof.html.haml b/app/views/report/problem_hof.html.haml
--- a/app/views/report/problem_hof.html.haml
+++ b/app/views/report/problem_hof.html.haml
@@ -22,8 +22,9 @@
   /=render partial: 'all_time_hof'
   Please select a problem.
 - else
-  %h1 [#{Problem.find(params[:id]).name}] #{Problem.find(params[:id]).full_name}
-  -# %h2 Submission History
-  -# =render partial: 'application/bar_graph', locals: { histogram: @histogram }
+  %h1
+    [#{Problem.find(params[:id]).name}] #{Problem.find(params[:id]).full_name}
+    - if @current_user.has_role?('ta')
+      %a{href:stat_problem_path(@problem)} (stat)
   =render partial: 'task_hof'
 
diff --git a/app/views/submissions/show.html.haml b/app/views/submissions/show.html.haml
--- a/app/views/submissions/show.html.haml
+++ b/app/views/submissions/show.html.haml
@@ -94,9 +94,9 @@
             %strong Grading Task Status
           %td
             = @task.status_str if @task
-            - if session[:admin]
+            - if @current_user.admin?
               = link_to "rejudge", rejudge_submission_path, data: {remote: true}, class: 'btn btn-info btn-xs'
-        - if session[:admin]
+        - if @current_user.has_role?('ta')
           %tr
             %td.text-right
               %strong IP
@@ -107,11 +107,11 @@
             %td
               - if @submission.tag_model?
                 YES
-                - if session[:admin]
+                - if @current_user.has_role?('ta')
                   = link_to "remove model status", set_tag_submission_path(@submission, tag: :default), class: 'btn btn-warning btn-xs'
               - else
                 No
-                - if session[:admin]
+                - if @current_user.has_role?('ta')
                   = link_to "set as model solution", set_tag_submission_path(@submission, tag: :model), class: 'btn btn-success btn-xs'