Resolved #1007 - trades and alerts now work again, which means they'll also work in multiplayer =)

android/assets/jsons/Translations/Other.json

@@ -1650,7 +1650,7 @@
 		Simplified_Chinese:"恭喜！你赢得了征服胜利！"
 		Portuguese:"Você ganhou uma vitória de dominação!"
 	}
-	
+	 
 	"You have achieved victory through the awesome power of your Culture. Your civilization's greatness - the magnificence of its monuments and the power of its artists - have astounded the world! Poets will honor you as long as beauty brings gladness to a weary heart.":{
 	}
 	

core/src/com/unciv/logic/civilization/CivilizationInfo.kt

@@ -91,6 +91,8 @@ class CivilizationInfo {
         toReturn.exploredTiles.addAll(gameInfo.tileMap.values.asSequence().map { it.position }.filter { it in exploredTiles })
         toReturn.notifications.addAll(notifications)
         toReturn.citiesCreated = citiesCreated
+        toReturn.popupAlerts.addAll(popupAlerts)
+        toReturn.tradeRequests.addAll(tradeRequests)
         return toReturn
     }
 

core/src/com/unciv/logic/trade/Trade.kt

@@ -41,6 +41,17 @@ class Trade{
 }
 
 
-class TradeRequest(val requestingCiv:String,
-                   /** Their offers are what they offer us, and our offers are what they want in return */
-                   val trade: Trade)
+class TradeRequest {
+
+    lateinit var requestingCiv: String
+
+    /** Their offers are what they offer us, and our offers are what they want in return */
+    lateinit var trade: Trade
+
+    constructor()  // for json serialization
+
+    constructor(requestingCiv: String, trade: Trade) {
+        this.requestingCiv = requestingCiv
+        this.trade = trade
+    }
+}