Only send LANG_NOT_ENOUGH_GOLD notification during trade if the trader does not have enough money...

Thanks 0xFuture.
Fixes issue #3587
Update THANKS file...

--HG--
branch : trunk

THANKS

@@ -65,4 +65,4 @@ Malcrom, Vladmim
 bkhorizon, n0n4m3, Chesterfield, Frankir, Wowka321, Morpheux, p0wer,
 Ouden, toshik, laise, yavi, Splinter, Syntec, Arthas, denyde, unholy,
 Vaughner, blackmanos, edrinn, Supabad, click, silverice, SupaBad, Xanadu,
-Socolin, Toni.Shocker
+Socolin, Toni.Shocker, Silinoron, 0xFuture, xK1

src/server/game/Server/Protocol/Handlers/TradeHandler.cpp

@@ -281,7 +281,7 @@ void WorldSession::HandleAcceptTradeOpcode(WorldPacket& /*recvPacket*/)
     }
 
     // not accept case incorrect money amount
-    if (trader->HasEnoughMoney(his_trade->GetMoney()))
+    if (!trader->HasEnoughMoney(his_trade->GetMoney()))
     {
         trader->GetSession()->SendNotification(LANG_NOT_ENOUGH_GOLD);
         his_trade->SetAccepted(false, true);