Fix difference in translation strings regarding the new Between Two Seas map (#416)

##Description:
I renamed all instances of "TwoSeas" to "BetweenTwoSeas". That way it
lowers the confusion but more importrantly - it removes the difference
between the translation strings for the map.

Please put your Discord username so you can be contacted if a bug or
regression is found:

<Nikola123>

src/core/configuration/DefaultConfig.ts

@@ -95,9 +95,11 @@ export abstract class DefaultServerConfig implements ServerConfig {
     }
     // Maps smaller than ~2 mil pixels
     if (
-      [GameMapType.TwoSeas, GameMapType.BlackSea, GameMapType.Pangaea].includes(
-        map,
-      )
+      [
+        GameMapType.BetweenTwoSeas,
+        GameMapType.BlackSea,
+        GameMapType.Pangaea,
+      ].includes(map)
     ) {
       return Math.random() < 0.2 ? 60 : 35;
     }

src/core/game/Game.ts

@@ -60,7 +60,7 @@ export enum GameMapType {
   Australia = "Australia",
   Iceland = "Iceland",
   Japan = "Japan",
-  TwoSeas = "Between Two Seas",
+  BetweenTwoSeas = "Between Two Seas",
   KnownWorld = "Known World",
 }
 

src/core/game/TerrainMapFileLoader.ts

@@ -39,7 +39,7 @@ const MAP_FILE_NAMES: Record<GameMapType, string> = {
   [GameMapType.Australia]: "Australia",
   [GameMapType.Iceland]: "Iceland",
   [GameMapType.Japan]: "Japan",
-  [GameMapType.TwoSeas]: "TwoSeas",
+  [GameMapType.BetweenTwoSeas]: "BetweenTwoSeas",
   [GameMapType.KnownWorld]: "KnownWorld",
 };