Makes map vote and roundstart smart about player count. (#5418)

* Makes map vote and roundstart smart about player count.
No more Saltern with 30 players, or Knight Ship with 50.

* a typo

* Address reviews.

* Localized.

Content.IntegrationTests/ContentIntegrationTest.cs

@@ -33,7 +33,10 @@ namespace Content.IntegrationTests
             (CCVars.HolidaysEnabled.Name, "false", false),
 
             // Avoid loading a large map by default for integration tests if none has been specified.
-            (CCVars.GameMap.Name, "Maps/Test/empty.yml", true)
+            (CCVars.GameMap.Name, "empty", true),
+
+            // Makes sure IGameMapManager actually listens.
+            (CCVars.GameMapForced.Name, "true", true)
         };
 
         private static void SetServerTestCvars(IntegrationOptions options)