Feat: Tournament Maps (#3483)

## Description:

Introduces 4 new private match maps for the OFM tournament in May.
Includes 2, 3, 4, and 8 player maps. Playtested, and include as many
default nations as the map expects players, named after compass points.
Give it a try at https://tourney-maps.openfront.dev/

<img width="1500" height="1500" alt="image"
src="https://github.com/user-attachments/assets/9138b636-5dd7-4118-82e2-50a5125a7963"
/>

The base images were created from scratch based on prototype designs,
and they were converted from vector versions I made. I haven't decided
on what the names should be for the maps themselves, so for now they're
just `Tourney Map 1`, `Tourney Map 2`, etc. Ideas welcome.


## 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:

bijx

resources/lang/en.json

@@ -329,6 +329,10 @@
     "svalmel": "Svalmel",
     "manicouagan": "Manicouagan",
     "lemnos": "Lemnos",
+    "tourney1": "Tourney 2 Teams",
+    "tourney2": "Tourney 3 Teams",
+    "tourney3": "Tourney 4 Teams",
+    "tourney4": "Tourney 8 Teams",
     "passage": "Passage",
     "sierpinski": "Sierpinski",
     "thebox": "The Box",
@@ -352,6 +356,7 @@
     "featured": "Featured",
     "continental": "Continental",
     "regional": "Regional",
+    "tournament": "Tournament",
     "fantasy": "Other",
     "special": "Special",
     "arcade": "Arcade"