Add Svalmel (#2600)

## Description:
This PR adds the Christmas map Svalmel with 5 nations.

Describe the PR.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

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

DISCORD_USERNAME
Nikola123

src/core/configuration/DefaultConfig.ts

@@ -80,6 +80,7 @@ const numPlayersConfig = {
   [GameMapType.Pluto]: [100, 70, 50],
   [GameMapType.SouthAmerica]: [70, 50, 40],
   [GameMapType.StraitOfGibraltar]: [100, 70, 50],
+  [GameMapType.Svalmel]: [40, 36, 30],
   [GameMapType.World]: [50, 30, 20],
 } as const satisfies Record<GameMapType, [number, number, number]>;
 

src/core/game/Game.ts

@@ -102,6 +102,7 @@ export enum GameMapType {
   Achiran = "Achiran",
   BaikalNukeWars = "Baikal (Nuke Wars)",
   FourIslands = "Four Islands",
+  Svalmel = "Svalmel",
   GulfOfStLawrence = "Gulf of St. Lawrence",
   Lisbon = "Lisbon",
 }
@@ -149,6 +150,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Achiran,
     GameMapType.BaikalNukeWars,
     GameMapType.FourIslands,
+    GameMapType.Svalmel,
   ],
 };