Add multiple funny maps april fools day (#3538)

## Description:
Requesting that these 4 maps be added temporarily for the April Fools
holiday. Included are:
- A wider version of the Amazon River to allow for larger ships.
- An edit of The Box with more varied terrain.
- A modification to The World which optimizes play for mobile users.
- A custom remix to Antarctica which re-adds ice to the map.
All maps are edits of existing work. All maps have been added as their
own individual map files rather than edits to existing files for ease of
management.

<img width="912" height="1067" alt="temp"
src="https://github.com/user-attachments/assets/089ef59f-8bdf-4c86-b479-620b8c220c3a"
/>
https://discord.com/channels/1284581928254701718/1483786939332169830

- [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

PlaysBadly

src/server/MapPlaylist.ts

@@ -38,7 +38,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   BlackSea: 6,
   Britannia: 5,
   BritanniaClassic: 4,
-  DeglaciatedAntarctica: 4,
+  ReglaciatedAntarctica: 12,
   EastAsia: 5,
   Europe: 3,
   EuropeClassic: 3,
@@ -63,7 +63,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   SouthAmerica: 5,
   StraitOfGibraltar: 5,
   Svalmel: 8,
-  World: 20,
+  WorldRotated: 15,
   Lemnos: 3,
   Passage: 4,
   TwoLakes: 6,
@@ -71,11 +71,11 @@ const frequency: Partial<Record<GameMapName, number>> = {
   Surrounded: 4,
   DidierFrance: 1,
   Didier: 1,
-  AmazonRiver: 3,
+  AmazonRiverWide: 12,
   BosphorusStraits: 3,
   BeringStrait: 4,
   Sierpinski: 10,
-  TheBox: 3,
+  TheBoxPlus: 12,
   Yenisei: 6,
   TradersDream: 4,
   Hawaii: 4,