Show terrain overriding yields in Civilopedia (#8796)

android/assets/jsons/translations/template.properties

@@ -1468,6 +1468,8 @@ Units: =
 Unit types = 
 Domain: [param] = 
 Toggle UI (World Screen only) = 
+Overrides yields from underlying terrain = 
+No yields = 
 
 # Policies
 

core/src/com/unciv/models/ruleset/tile/Terrain.kt

@@ -74,9 +74,11 @@ class Terrain : RulesetStatsObject() {
         }
 
         val stats = cloneStats()
-        if (!stats.isEmpty()) {
+        if (!stats.isEmpty() || overrideStats) {
             textList += FormattedLine()
-            textList += FormattedLine("$stats")
+            textList += FormattedLine(if (stats.isEmpty()) "No yields" else "$stats")
+            if (overrideStats)
+                textList += FormattedLine("Overrides yields from underlying terrain")
         }
 
         if (occursOn.isNotEmpty() && !hasUnique(UniqueType.NoNaturalGeneration)) {