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

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

@@ -185,6 +185,46 @@
       "coordinates": [876, 1049],
       "name": "Gabon",
       "flag": "ga"
+    },
+    {
+      "coordinates": [355, 1500],
+      "name": "Saint Helena",
+      "flag": "sh"
+    },
+    {
+      "coordinates": [127, 279],
+      "name": "Canary Islands",
+      "flag": "ic"
+    },
+    {
+      "coordinates": [1428, 90],
+      "name": "Cyprus",
+      "flag": "cy"
+    },
+    {
+      "coordinates": [1707, 1381],
+      "name": "Comoros",
+      "flag": "km"
+    },
+    {
+      "coordinates": [1758, 1411],
+      "name": "Mayotte",
+      "flag": "yt"
+    },
+    {
+      "coordinates": [117, 1278],
+      "name": "Ascension Island",
+      "flag": "sh-ac"
+    },
+    {
+      "coordinates": [756, 964],
+      "name": "Equatorial Guinea",
+      "flag": "gq"
+    },
+    {
+      "coordinates": [697, 1053],
+      "name": "Sao Tome and Principe",
+      "flag": "st"
     }
   ]
 }

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

@@ -78,7 +78,7 @@
     {
       "coordinates": [585, 1182],
       "name": "Mecklenburg-Schwerin",
-      "flag": "German Empire"
+      "flag": "German Confederation"
     },
     {
       "coordinates": [846, 1131],
@@ -88,12 +88,12 @@
     {
       "coordinates": [59, 1201],
       "name": "Oldenburg",
-      "flag": "German Empire"
+      "flag": "German Confederation"
     },
     {
       "coordinates": [302, 1143],
       "name": "Hamburg",
-      "flag": "German Empire"
+      "flag": "German Confederation"
     },
     {
       "coordinates": [219, 1205],

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

@@ -350,6 +350,16 @@
       "coordinates": [1811, 782],
       "name": "Massachusetts",
       "flag": "Massachusetts"
+    },
+    {
+      "coordinates": [2719, 1264],
+      "name": "Cabo Verde",
+      "flag": "cv"
+    },
+    {
+      "coordinates": [2638, 840],
+      "name": "Azores",
+      "flag": "pt-azores"
     }
   ]
 }

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

@@ -3,7 +3,7 @@
   "name": "Two Lakes",
   "translation_key": "map.twolakes",
   "categories": ["europe"],
-  "multiplayer_frequency": 6,
+  "multiplayer_frequency": 4,
   "nations": [
     {
       "coordinates": [1025, 750],