Fixed small errors in map jsons (#430)

## Description:

This PR fixed small errors in the jsons of a few map(this includes names
of nations and a wrong flag)

Fixes #475 

## Please complete the following:

- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

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

<Nikola123>

resources/maps/Africa.json

@@ -91,7 +91,7 @@
       "coordinates": [1094, 1093],
       "name": "Democratic Republic of the Congo",
       "strength": 2,
-      "flag": "cg"
+      "flag": "cd"
     },
     {
       "coordinates": [1021, 1365],

resources/maps/Mena.json

@@ -53,7 +53,7 @@
     },
     {
       "coordinates": [1409, 372],
-      "name": "Palestinian Territory, Occupied",
+      "name": "Palestinian Territory",
       "strength": 1,
       "flag": "ps"
     },
@@ -173,7 +173,7 @@
     },
     {
       "coordinates": [98, 55],
-      "name": "2",
+      "name": "Mauritania",
       "strength": 1,
       "flag": "mr"
     },

resources/maps/Oceania.json

@@ -71,7 +71,7 @@
     },
     {
       "coordinates": [182, 43],
-      "name": "Viet Nam",
+      "name": "Vietnam",
       "strength": 1,
       "flag": "vn"
     },
@@ -107,7 +107,7 @@
     },
     {
       "coordinates": [834, 215],
-      "name": "Micronesia, Federated States of",
+      "name": "Federated States of Micronesia",
       "strength": 1,
       "flag": "fm"
     },

resources/maps/WorldMap.json

@@ -185,7 +185,7 @@
     },
     {
       "coordinates": [1238, 309],
-      "name": "Iran, Islamic Republic Of",
+      "name": "Islamic Republic Of Iran",
       "strength": 1,
       "flag": "ir"
     },
@@ -239,7 +239,7 @@
     },
     {
       "coordinates": [1074, 508],
-      "name": "Congo, The Democratic Republic of the",
+      "name": "The Democratic Republic of the Congo",
       "strength": 1,
       "flag": "cd"
     },