Added Kremlin wonder

Credits.md

@@ -199,6 +199,7 @@ All the following are from [the Noun Project](https://thenounproject.com) licenc
 * [Eiffel Tower](https://thenounproject.com/term/eiffel-tower/1907757/) By Felipe Alvarado
 * [Statue of Liberty](https://thenounproject.com/search/?q=statue%20of%20liberty&i=1801199) By 1516
 * [Christ the redeemer](https://thenounproject.com/term/christ-the-redeemer/56112/) By Stefan Spieler for Cristo Redentor
+* [St. Petersburg](https://thenounproject.com/search/?q=kremlin&i=1569704) By Carpe Diem for Kremlin
 
 ### Information Era
 

android/assets/jsons/Buildings.json

@@ -577,6 +577,13 @@
 		uniques:["Culture cost of adopting new Policies reduced by 10%"],
 		requiredTech:"Flight"
 	},
+	{
+		name:"Kremlin",
+		culture:3,
+		isWonder:true,
+		uniques:["Defensive buildings in all cities are 25% more effective"],
+		requiredTech:"Railroad"
+	},
 	
 	// Information Era
 	

android/assets/jsons/Translations.json

@@ -1324,16 +1324,7 @@
         Portuguese:"Nome do jogo salvo"
 	}
 
-	"Copy game info":{
-		Italian:"Copia le informazioni sul gioco"
-		Russian:"Копировать информацию об игре"
-		French:"Copier les données de la partie"
-		Romanian:"Copiază informațiile jocului"
-		German:"Spielinfo kopieren"
-		Dutch:"Spelinformatie kopiëren"
-		Spanish:"Copiar información de partida"
-        Simplified_Chinese:"复制游戏信息"
-        Portuguese:"Copiar informação do jogo"
+	"Copy to clipboard":{
 	}
 
 	"Could not load game":{
@@ -5239,6 +5230,11 @@
         Portuguese:"Custo cultural de adotar novas políticas reduzido em 10%"
 	}
 	
+	"Kremlin":{
+	}
+	"Defensive buildings in all cities are 25% more effective":{
+	}
+	
 	"Military Academy":{	
 		Italian:"Accademia Militare"
 		Russian:"Военная академия"

core/src/com/unciv/logic/battle/CityCombatant.kt

@@ -52,7 +52,10 @@ class CityCombatant(val city: CityInfo) : ICombatant {
         if(cityTile.militaryUnit!=null)
             strength += cityTile.militaryUnit!!.baseUnit().strength * cityTile.militaryUnit!!.health/100f
 
-        strength += city.cityConstructions.getBuiltBuildings().sumBy{ it.cityStrength }
+        var buildingsStrength = city.cityConstructions.getBuiltBuildings().sumBy{ it.cityStrength }.toFloat()
+        if(getCivInfo().getBuildingUniques().contains("Defensive buildings in all cities are 25% more effective"))
+            buildingsStrength*=1.25f
+        strength += buildingsStrength
 
         return strength.toInt()
     }

core/src/com/unciv/ui/saves/SaveScreen.kt

@@ -47,7 +47,7 @@ class SaveScreen : PickerScreen() {
         newSave.add("Saved game name".toLabel()).row()
         newSave.add(textField).width(300f).pad(10f).row()
 
-        val copyJsonButton = TextButton("Copy game info".tr(),skin)
+        val copyJsonButton = TextButton("Copy to clipboard".tr(),skin)
         copyJsonButton.onClick {
             val json = Json().toJson(game.gameInfo)
             val base64Gzip = Gzip.zip(json)