Remove vestigial translation plumbing.

This was never completed to the level required to
be properly used ingame.

OpenRA.Game/Settings.cs

@@ -190,9 +190,6 @@ namespace OpenRA
 
 		public int BatchSize = 8192;
 		public int SheetSize = 2048;
-
-		public string Language = "english";
-		public string DefaultLanguage = "english";
 	}
 
 	public class SoundSettings