enhancement: trade offer accepted (AscensionGameDev#2236)

- The trade button is now disabled upon pressing it.
- Players will now receive an informative message when the counterparty accepts theirs offer, indicating readiness for the trade to proceed.

Author: Arufonsu

Intersect.Client/Interface/Game/Trades/TradingWindow.cs

@@ -200,6 +200,7 @@ public FloatRect RenderBounds()
         void trade_Clicked(Base sender, ClickedEventArgs arguments)
         {
             mTrade.Text = Strings.Trading.pending;
+            mTrade.IsDisabled = true;
             PacketSender.SendAcceptTrade();
         }
 

Intersect.Server.Core/Localization/Strings.cs

@@ -1487,6 +1487,9 @@ public sealed partial class TradingNamespace : LocaleNamespace
             public readonly LocalizedString itemsdropped =
                 @"Out of inventory space. Some of your items have been dropped on the ground!";
 
+            [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+            public readonly LocalizedString OfferAccepted = @"{00} has accepted your offer. Please confirm the trade.";
+
             [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
             public readonly LocalizedString offerinvalid = @"Invalid item selected to offer!";
 

Intersect.Server.Core/Networking/PacketHandler.cs

@@ -2267,6 +2267,12 @@ public void HandlePacket(Client client, AcceptTradePacket packet)
                 player.Trading.Counterparty.Trading.Counterparty = null;
                 player.Trading.Counterparty = null;
             }
+            else
+            {
+                PacketSender.SendChatMsg(
+                    player.Trading.Counterparty, Strings.Trading.OfferAccepted.ToString(player.Name), ChatMessageType.Trading, CustomColors.Alerts.Accepted
+                );
+            }
         }
 
         //DeclineTradePacket