Add Falkland Islands map (#681)

## Description:
This PR adds the Falkland Islands map. It has 12 nations - most of the
regions of the islands. All use the Falkland Island flag as they don't
have their own.

## Please complete the following:

- [ ] I have added screenshots for all UI updates
- [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:

<DISCORD USERNAME>
Nikola123

src/client/components/Maps.ts

@@ -26,6 +26,7 @@ export const MapDescription: Record<keyof typeof GameMapType, string> = {
   KnownWorld: "Known World",
   FaroeIslands: "Faroe Islands",
   DeglaciatedAntarctica: "Deglaciated Antarctica",
+  FalklandIslands: "Falkland Islands",
 };
 
 @customElement("map-display")