Rename Mediterranean to Mare Nostrum 🏛️ (#3768)

## Description:

Change inspired by Territorial.io . Renames the Mediterranean sea map to
Mare Nostrum, the ancient name of the sea given by the Romans. The NPCs
of the map are already roman provinces, so this change is more thematic
and also adds a creative name like "Gateway to the Atlantic" and
"Between Two Seas"

## 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:

tri.star1011

map-generator/assets/maps/marenostrum/info.json

@@ -1,5 +1,5 @@
 {
-  "name": "mediterranean",
+  "name": "Mare Nostrum",
   "nations": [
     {
       "coordinates": [141, 574],

map-generator/main.go

@@ -85,7 +85,7 @@ var maps = []struct {
 	{Name: "sanfrancisco"},
 	{Name: "aegean"},
 	{Name: "milkyway"},
-	{Name: "mediterranean"},
+	{Name: "marenostrum"},
 	{Name: "greatlakes"},
 	{Name: "dyslexdria"},
 	{Name: "luna"},

resources/lang/en.json

@@ -358,7 +358,7 @@
     "sanfrancisco": "San Francisco",
     "aegean": "Aegean",
     "milkyway": "Milky Way",
-    "mediterranean": "Mediterranean",
+    "marenostrum": "Mare Nostrum",
     "dyslexdria": "Dyslexdria",
     "greatlakes": "Great Lakes",
     "straitofmalacca": "Strait Of Malacca",

resources/maps/marenostrum/manifest.json

@@ -14,7 +14,7 @@
     "num_land_tiles": 652112,
     "width": 1424
   },
-  "name": "mediterranean",
+  "name": "Mare Nostrum",
   "nations": [
     {
       "coordinates": [141, 574],

src/core/game/Game.ts

@@ -144,7 +144,7 @@ export enum GameMapType {
   SanFrancisco = "San Francisco",
   Aegean = "Aegean",
   MilkyWay = "MilkyWay",
-  Mediterranean = "Mediterranean",
+  MareNostrum = "Mare Nostrum",
   Dyslexdria = "Dyslexdria",
   GreatLakes = "Great Lakes",
   StraitOfMalacca = "Strait Of Malacca",
@@ -208,7 +208,7 @@ export const mapCategories: Record<string, GameMapType[]> = {
     GameMapType.Arctic,
     GameMapType.SanFrancisco,
     GameMapType.Aegean,
-    GameMapType.Mediterranean,
+    GameMapType.MareNostrum,
     GameMapType.GreatLakes,
     GameMapType.StraitOfMalacca,
     GameMapType.Conakry,

src/server/MapPlaylist.ts

@@ -83,7 +83,7 @@ const frequency: Partial<Record<GameMapName, number>> = {
   SanFrancisco: 3,
   Aegean: 6,
   MilkyWay: 8,
-  Mediterranean: 6,
+  MareNostrum: 6,
   Dyslexdria: 8,
   GreatLakes: 6,
   StraitOfMalacca: 4,