Resolved #1157 - Added popup for entering Golden Age

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

@@ -33,6 +33,7 @@ class GoldenAgeManager{
         turnsToGoldenAge *= civInfo.gameInfo.gameParameters.gameSpeed.getModifier()
         turnsLeftForCurrentGoldenAge += turnsToGoldenAge.toInt()
         civInfo.addNotification("You have entered a golden age!", null, Color.GOLD)
+        civInfo.popupAlerts.add(PopupAlert(AlertType.GoldenAge,""))
     }
 
     fun endTurn(happiness: Int) {

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

@@ -12,6 +12,7 @@ enum class AlertType{
     CitiesSettledNearOtherCiv,
     DemandToStopSettlingCitiesNear,
     CitySettledNearOtherCivDespiteOurPromise,
+    GoldenAge,
 }
 
 class PopupAlert {

core/src/com/unciv/ui/worldscreen/AlertPopup.kt

@@ -139,6 +139,12 @@ class AlertPopup(val worldScreen: WorldScreen, val popupAlert: PopupAlert): Popu
                 add(centerTable).row()
                 add(getCloseButton("Close"))
             }
+            AlertType.GoldenAge -> {
+                addGoodSizedLabel("GOLDEN AGE")
+                addSeparator()
+                addGoodSizedLabel("Your citizens have been happy with your rule for so long that the empire enters a Golden Age!").row()
+                add(getCloseButton("Close"))
+            }
         }
         open()
         worldScreen.alertPopupIsOpen = true