forbid to observer in both arenas

i18n.json

@@ -182,7 +182,7 @@
     "unwelcome_warn_part2": "，您的对手可能会离你而去。",
     "unwelcome_tip_part1": "因为您的对手有",
     "unwelcome_tip_part2": "行为，现在您可以直接离开游戏或投降，不视为强退。",
-    "cannot_to_observer": "竞技匹配中决斗者不允许观战。",
+    "cannot_to_observer": "匹配模式中决斗者不允许观战。",
     "athletic_arena_tip": "在竞技匹配中，比赛开始前退出游戏也会视为投降。"
   },
  "ko-kr": {

ygopro-server.coffee

@@ -1311,7 +1311,7 @@ ygopro.stoc_follow 'GAME_MSG', false, (buffer, info, client, server)->
 ygopro.ctos_follow 'HS_TOOBSERVER', true, (buffer, info, client, server)->
   room=ROOM_all[client.rid]
   return unless room
-  if room.arena != "athletic" or client.ip == "::ffff:127.0.0.1"
+  if not room.arena or client.ip == "::ffff:127.0.0.1"
     return false
   for player in room.players
     if player == client

ygopro-server.js

@@ -1573,7 +1573,7 @@
     if (!room) {
       return;
     }
-    if (room.arena !== "athletic" || client.ip === "::ffff:127.0.0.1") {
+    if (!room.arena || client.ip === "::ffff:127.0.0.1") {
       return false;
     }
     ref = room.players;