Add Two Lakes (#2743)

## Description:
This PR adds the Two Lakes map, based on the irl area around lake Ohrid
and lake Prespa

Describe the PR.

## 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:

DISCORD_USERNAME
Nikola123

resources/lang/en.json

@@ -245,7 +245,8 @@
     "lisbon": "Lisbon",
     "svalmel": "Svalmel",
     "manicouagan": "Manicouagan",
-    "lemnos": "Lemnos"
+    "lemnos": "Lemnos",
+    "twolakes": "Two Lakes"
   },
   "map_categories": {
     "continental": "Continental",

resources/maps/twolakes/manifest.json

@@ -0,0 +1,40 @@
+{
+  "map": {
+    "height": 1840,
+    "num_land_tiles": 3426566,
+    "width": 2100
+  },
+  "map16x": {
+    "height": 460,
+    "num_land_tiles": 211836,
+    "width": 525
+  },
+  "map4x": {
+    "height": 920,
+    "num_land_tiles": 853511,
+    "width": 1050
+  },
+  "name": "Two Lakes",
+  "nations": [
+    {
+      "coordinates": [1025, 750],
+      "name": "Galicica"
+    },
+    {
+      "coordinates": [1815, 820],
+      "name": "Pelister"
+    },
+    {
+      "coordinates": [920, 1250],
+      "name": "Podgorie"
+    },
+    {
+      "coordinates": [100, 1410],
+      "name": "Valamara"
+    },
+    {
+      "coordinates": [1320, 1485],
+      "name": "Prespa"
+    }
+  ]
+}