Add Germany Map and state flags (#4513)

Resolves #4390 

## Description:

- Adds new map, Germany, filed under the New and Europe categories, for
use in Singleplayer and Custom lobbies.
- Adds map to lobby rotation.
- Adds new flags to represent all 16 Federal German states (including a
variant of Bavaria), all to the ISO standard (DE-XX)

Map Info:
Size: 1548x1519, 2,351,412 total. 451,764 water pixels (19.2%), 826,627
impassable pixels (35.2%)
Nations: 16, all of which are Federal German States

Yes, the size has changed and also has impassable terrain added now

<img width="652" height="887" alt="image"
src="https://github.com/user-attachments/assets/6499382e-f073-4ef8-956c-4e80ef09d4b8"
/>
<img width="917" height="905" alt="image"
src="https://github.com/user-attachments/assets/d9c7a532-c2fd-415a-a51d-709be3b43aae"
/>
<img width="922" height="1140" alt="image"
src="https://github.com/user-attachments/assets/fca34d84-414c-4b3f-91ec-f0a21883caa6"
/>

## 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

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

lengy_

Sorry if I've done anything wrong or the files are out of date, I made
the map a week ago, my fork is a mess and I'm still quite new to how
exactly GitHub works.

src/core/game/Maps.gen.ts

@@ -43,6 +43,7 @@ export enum GameMapType {
   FaroeIslands = "Faroe Islands", // map-generator/assets/maps/faroeislands/info.json
   FourIslands = "Four Islands", // map-generator/assets/maps/fourislands/info.json
   GatewayToTheAtlantic = "Gateway to the Atlantic", // map-generator/assets/maps/gatewaytotheatlantic/info.json
+  Germany = "Germany", // map-generator/assets/maps/germany/info.json
   GiantWorldMap = "Giant World Map", // map-generator/assets/maps/giantworldmap/info.json
   GreatLakes = "Great Lakes", // map-generator/assets/maps/greatlakes/info.json
   GulfOfStLawrence = "Gulf of St. Lawrence", // map-generator/assets/maps/gulfofstlawrence/info.json
@@ -458,6 +459,13 @@ export const maps: readonly MapInfo[] = [
     categories: ["europe"],
     multiplayerFrequency: 5,
   },
+  {
+    id: "Germany",
+    type: GameMapType.Germany,
+    translationKey: "map.germany",
+    categories: ["europe", "new"],
+    multiplayerFrequency: 5,
+  },
   {
     id: "GiantWorldMap",
     type: GameMapType.GiantWorldMap,