Add the Lisbon Map and Credit Copernicus DEM (#2545)

## Description:

Adds a map based on Lisbon and the surrounding area. Also credits the
ESA's Copernicus Digital Elevation Model, which was used to create this
map and the Gulf of St. Lawrence map.

<img width="1257" height="1257" alt="screenshot of the new Lisbon map"
src="https://github.com/user-attachments/assets/39fa73da-c77d-4d5c-8d00-7ee2794d0298"
/>

## Checklist:

- [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

## Discord Username:

sehentsin

src/core/game/Game.ts

@@ -102,6 +102,7 @@ export enum GameMapType {
   BaikalNukeWars = "Baikal (Nuke Wars)",
   FourIslands = "Four Islands",
   GulfOfStLawrence = "Gulf of St. Lawrence",
+  Lisbon = "Lisbon",
 }
 
 export type GameMapName = keyof typeof GameMapType;
@@ -136,6 +137,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Japan,
     GameMapType.Montreal,
     GameMapType.GulfOfStLawrence,
+    GameMapType.Lisbon,
   ],
   fantasy: [
     GameMapType.Pangaea,