Add translation arguments to the Lua API.

OpenRA.Mods.Common/Scripting/Global/UserInterfaceGlobal.cs

@@ -9,6 +9,8 @@
  */
 #endregion
 
+using System.Collections.Generic;
+using Eluant;
 using OpenRA.Mods.Common.Widgets;
 using OpenRA.Primitives;
 using OpenRA.Scripting;
@@ -32,8 +34,26 @@ namespace OpenRA.Mods.Common.Scripting.Global
 			luaLabel.GetColor = () => c;
 		}
 
-		public string Translate(string text)
+		public string Translate(string text, LuaTable table = null)
 		{
+			if (table != null)
+			{
+				var argumentDictionary = new Dictionary<string, object>();
+				foreach (var kv in table)
+				{
+					using (kv.Key)
+					using (kv.Value)
+					{
+						if (!kv.Key.TryGetClrValue(out string variable) || !kv.Value.TryGetClrValue(out object value))
+							throw new LuaException($"Translation arguments requires a table of [\"string\"]=value pairs. Received {kv.Key.WrappedClrType().Name},{kv.Value.WrappedClrType().Name}");
+
+						argumentDictionary.Add(variable, value);
+					}
+				}
+
+				return Context.World.Map.Translate(text, argumentDictionary);
+			}
+
 			return Context.World.Map.Translate(text);
 		}
 	}