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/client/components/Maps.ts

@@ -21,7 +21,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   Australia: "Australia",
   Iceland: "Iceland",
   Japan: "Japan",
-  TwoSeas: "Between Two Seas",
+  BetweenTwoSeas: "Between Two Seas",
   KnownWorld: "Known World",
 };
 

src/client/utilities/Maps.ts

@@ -1,6 +1,7 @@
 import africa from "../../../resources/maps/AfricaThumb.webp";
 import asia from "../../../resources/maps/AsiaThumb.webp";
 import australia from "../../../resources/maps/AustraliaThumb.webp";
+import betweenTwoSeas from "../../../resources/maps/BetweenTwoSeasThumb.webp";
 import blackSea from "../../../resources/maps/BlackSeaThumb.webp";
 import britannia from "../../../resources/maps/BritanniaThumb.webp";
 import europe from "../../../resources/maps/EuropeThumb.webp";
@@ -14,7 +15,6 @@ import northAmerica from "../../../resources/maps/NorthAmericaThumb.webp";
 import oceania from "../../../resources/maps/OceaniaThumb.webp";
 import pangaea from "../../../resources/maps/PangaeaThumb.webp";
 import southAmerica from "../../../resources/maps/SouthAmericaThumb.webp";
-import twoSeas from "../../../resources/maps/TwoSeasThumb.webp";
 import world from "../../../resources/maps/WorldMapThumb.webp";
 
 import { GameMapType } from "../../core/game/Game";
@@ -53,8 +53,8 @@ export function getMapsImage(map: GameMapType): string {
       return iceland;
     case GameMapType.Japan:
       return japan;
-    case GameMapType.TwoSeas:
-      return twoSeas;
+    case GameMapType.BetweenTwoSeas:
+      return betweenTwoSeas;
     case GameMapType.KnownWorld:
       return knownworld;
     default: