minor formatting fix

views/user/user.etlua

@@ -29,7 +29,7 @@
         <% if tonumber(post.edited_at) > tonumber(post.created_at) then -%>
             Edited in <%= post.thread_title %> at <%= os.date("%c", post.edited_at) %>
           <% else -%>
-            Posted in <%= post.thread_title %> at <%= os.date("%c", post.created_at) %>
+            Posted in <%= post.thread_title %> on <%= os.date("%c", post.created_at) %>
           <% end -%>
       </i></a></div>
       </div>