prevent ban box from overflowing mobile screen (ugly)

lib/philomena_web/templates/ban/_bans.html.slime

@@ -3,7 +3,7 @@ table.table
     tr
       th Ban Enacted
       th Ban Expires
-      th Duration
+      th.hide-mobile Duration
       th Active?
       th Reason
       th Ban ID
@@ -12,10 +12,10 @@ table.table
       tr
         td = pretty_time b.created_at
         td = pretty_time b.valid_until
-        td = distance_of_time_in_words b.created_at, b.valid_until
+        td.hide-mobile = distance_of_time_in_words b.created_at, b.valid_until
         = if active?(b) do
           td.success Yes
         - else
           td.danger No
         td = b.reason
-        td = b.generated_ban_id
+        td = b.generated_ban_id