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Sorry if I've done anything wrong or the files are out of date, I made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.

package-lock.json

@@ -3453,9 +3453,9 @@
       "license": "ISC"
     },
     "node_modules/brace-expansion": {
-      "version": "5.0.5",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.5.tgz",
-      "integrity": "sha512-VZznLgtwhn+Mact9tfiwx64fA9erHH/MCXEUfB/0bX/6Fz6ny5EGTXYltMocqg4xFAQZtnO3DHWWXi8RiuN7cQ==",
+      "version": "5.0.6",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.6.tgz",
+      "integrity": "sha512-kLpxurY4Z4r9sgMsyG0Z9uzsBlgiU/EFKhj/h91/8yHu0edo7XuixOIH3VcJ8kkxs6/jPzoI6U9Vj3WqbMQ94g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {