Show messages on contest management view

app/views/contests/show.html.slim

@@ -46,6 +46,27 @@
       .col
         a.btn.btn-primary href=new_contest_puzzle_path(@contest)
           = t("contests.show.add_puzzle")
+    - if @messages
+      .row.mt-5
+        .col
+          h4 = t("messages.plural").capitalize
+      table.table.table-striped.table-hover
+        thead
+          tr
+            th scope="col"
+              | Time
+            th scope="col"
+              | Text
+        tbody
+          - @messages.each do |message|
+            tr.align-middle scope="row"
+              td
+                = message.time_seconds
+              td
+                = message.text
+              td
+                a.btn.btn-sm.btn-danger href=""
+                  | Delete
   .col-6
     .row
       .col