Multiple terrain changes and fixes for maps (#4502)

## Description:

Multiple changes for maps:

Mississippi - Fix some landlocked lakes, near the main coast. Players
would sometimes accidentally put a port in the dead lakes

North America - Re-add the Azores and Cape verde (accidentally removed
when the map generator got updated to delete small islands)

Africa - Re-add Ascencion and Saint Helena Islands, same case as NA

Danish Straits - replace german empire flag , as agreed in the leads
channel

Giant World Map - Coast fixes, including adding Suez Canal which greatly
affected trade routes

Great Lakes - fix landlocked lake

Two Lakes - New Terrain combining both old and recent versions

World - Add strait of malacca

## 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

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tri.star1011

src/core/game/Maps.gen.ts

@@ -835,7 +835,7 @@ export const maps: readonly MapInfo[] = [
     type: GameMapType.TwoLakes,
     translationKey: "map.twolakes",
     categories: ["europe"],
-    multiplayerFrequency: 6,
+    multiplayerFrequency: 4,
   },
   {
     id: "UnitedStates",