Add Map - Dyslexdria - April Fools (#3413)

Re-submission, previous request was not branched properly.

Add custom map Dyslexdria. Based off of large_world_map_recolor.tif and
rivers from the XL World map. Map is intended for long term use.
Suggesting that map be used as an April Fools gag by replacing thumbnail
and title with 'World' during first run.

<img width="995" height="721" alt="dyslexdria screenshot"
src="https://github.com/user-attachments/assets/8826839f-b4e0-431d-af9c-0b0e43dc601d"
/>

- [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

- Build log, screen shots, and test videos.
https://discord.com/channels/1284581928254701718/1456890656147374080

PlaysBadly

---------

Co-authored-by: Duwibi <86431918+Duwibi@users.noreply.github.com>
Co-authored-by: VariableVince <24507472+VariableVince@users.noreply.github.com>

src/server/MapPlaylist.ts

@@ -37,6 +37,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   BlackSea: 6,
   Britannia: 5,
   BritanniaClassic: 4,
+  Dyslexdria: 12,
   ReglaciatedAntarctica: 12,
   EastAsia: 5,
   Europe: 3,