Restructured PR for Britannia Remastered Addition (#2813)

## Description:

Adds a new detailed Britannia map featuring modern UK, Ireland, and
northern France regions. The previous Britannia map has been preserved
as "Britannia Classic".

<img width="4096" height="5031" alt="United Kingdom"
src="https://github.com/user-attachments/assets/8a6ca3ab-bc91-438f-8ca7-7fdf7c5260b8"
/>

<img width="4096" height="5031" alt="United Kingdom_debug"
src="https://github.com/user-attachments/assets/a9a7bcd2-1dc5-40c6-a547-a7a79e636060"
/>



Changes
Added new Britannia map with modern county/region divisions
Renamed existing Britannia map to "Britannia Classic"
Added map-generator source assets for both maps
Updated GameMapType enum with BritanniaClassic
Configured player counts: 50/30/20 for both maps
Added playlist frequencies: Britannia (5), Britannia Classic (4)
Updated language translations

New Britannia Nations (partial list)
Ireland: Mayo, Kerry, Clare, Meath, and more
Scotland: Highland, Argyll and Bute, and more
England: North Yorkshire, and more
France: Pas-de-Calais
Britannia Classic

The original Britannia map with historical kingdoms (Dumnonia, Dyfed,
Gwent, Gwynedd, Powys, Strathclyde, Dalriata, Wessex, Sussex, Kent,
etc.) is now available as "Britannia Classic".

## 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:

TSProphet

---------

Co-authored-by: Harry <Harry.bath94@gmail.com>
Co-authored-by: iamlewis <lewismmmm@gmail.com>

src/client/components/Maps.ts

@@ -23,6 +23,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   Asia: "Asia",
   Mars: "Mars",
   SouthAmerica: "South America",
+  BritanniaClassic: "Britannia Classic",
   Britannia: "Britannia",
   GatewayToTheAtlantic: "Gateway to the Atlantic",
   Australia: "Australia",

src/core/configuration/DefaultConfig.ts

@@ -57,6 +57,7 @@ const numPlayersConfig = {
   [GameMapType.BetweenTwoSeas]: [70, 50, 40],
   [GameMapType.BlackSea]: [50, 30, 30],
   [GameMapType.Britannia]: [50, 30, 20],
+  [GameMapType.BritanniaClassic]: [50, 30, 20],
   [GameMapType.DeglaciatedAntarctica]: [50, 40, 30],
   [GameMapType.EastAsia]: [50, 30, 20],
   [GameMapType.Europe]: [100, 70, 50],

src/core/game/Game.ts

@@ -82,6 +82,7 @@ export enum GameMapType {
   Pangaea = "Pangaea",
   Asia = "Asia",
   Mars = "Mars",
+  BritanniaClassic = "Britannia Classic",
   Britannia = "Britannia",
   GatewayToTheAtlantic = "Gateway to the Atlantic",
   Australia = "Australia",
@@ -134,8 +135,9 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Oceania,
   ],
   regional: [
-    GameMapType.BlackSea,
+    GameMapType.BritanniaClassic,
     GameMapType.Britannia,
+    GameMapType.BlackSea,
     GameMapType.GatewayToTheAtlantic,
     GameMapType.BetweenTwoSeas,
     GameMapType.Iceland,

src/server/MapPlaylist.ts

@@ -30,6 +30,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   BetweenTwoSeas: 5,
   BlackSea: 6,
   Britannia: 5,
+  BritanniaClassic: 4,
   DeglaciatedAntarctica: 4,
   EastAsia: 5,
   Europe: 3,