Add support for game translation

OpenRA.Game/GameRules/Settings.cs

@@ -96,6 +96,9 @@ namespace OpenRA.GameRules
 		public int BatchSize = 8192;
 		public int NumTempBuffers = 8;
 		public int SheetSize = 2048;
+
+		public string Language = "english";
+		public string DefaultLanguage = "english";
 	}
 
 	public class SoundSettings

OpenRA.Game/Map.cs

@@ -99,6 +99,7 @@ namespace OpenRA
 		[FieldLoader.Ignore] public List<MiniYamlNode> Weapons = new List<MiniYamlNode>();
 		[FieldLoader.Ignore] public List<MiniYamlNode> Voices = new List<MiniYamlNode>();
 		[FieldLoader.Ignore] public List<MiniYamlNode> Notifications = new List<MiniYamlNode>();
+		[FieldLoader.Ignore] public List<MiniYamlNode> Translations = new List<MiniYamlNode>();
 
 		// Binary map data
 		[FieldLoader.Ignore] public byte TileFormat = 1;
@@ -191,6 +192,7 @@ namespace OpenRA
 			Weapons = MiniYaml.NodesOrEmpty(yaml, "Weapons");
 			Voices = MiniYaml.NodesOrEmpty(yaml, "Voices");
 			Notifications = MiniYaml.NodesOrEmpty(yaml, "Notifications");
+			Translations = MiniYaml.NodesOrEmpty(yaml, "Translations");
 
 			CustomTerrain = new string[MapSize.X, MapSize.Y];
 
@@ -247,6 +249,7 @@ namespace OpenRA
 			root.Add(new MiniYamlNode("Weapons", null, Weapons));
 			root.Add(new MiniYamlNode("Voices", null, Voices));
 			root.Add(new MiniYamlNode("Notifications", null, Notifications));
+			root.Add(new MiniYamlNode("Translations", null, Translations));
 
 			var entries = new Dictionary<string, byte[]>();
 			entries.Add("map.bin", SaveBinaryData());

OpenRA.Game/ModData.cs

@@ -44,6 +44,7 @@ namespace OpenRA
 
 		public ModData(params string[] mods)
 		{
+			Languages = new string[0];
 			Manifest = new Manifest(mods);
 			ObjectCreator = new ObjectCreator(Manifest);
 			LoadScreen = ObjectCreator.CreateObject<ILoadScreen>(Manifest.LoadScreen.Value);
@@ -71,6 +72,47 @@ namespace OpenRA
 			CursorProvider.Initialize(Manifest.Cursors);
 		}
 
+		public IEnumerable<string> Languages { get; private set; }
+
+		void LoadTranslations(Map map)
+		{
+			var selectedTranslations = new Dictionary<string, string>();
+			var defaultTranslations = new Dictionary<string, string>();
+
+			if (!Manifest.Translations.Any())
+			{
+				Languages = new string[0];
+				FieldLoader.Translations = new Dictionary<string, string>();
+				return;
+			}
+			
+			var yaml = Manifest.Translations.Select(MiniYaml.FromFile).Aggregate(MiniYaml.MergeLiberal);
+			Languages = yaml.Select(t => t.Key).ToArray();
+
+			yaml = MiniYaml.MergeLiberal(map.Translations, yaml);
+
+			foreach (var y in yaml)
+			{
+				if (y.Key == Game.Settings.Graphics.Language)
+					selectedTranslations = y.Value.NodesDict.ToDictionary(x => x.Key, x => x.Value.Value ?? "");
+				if (y.Key == Game.Settings.Graphics.DefaultLanguage)
+					defaultTranslations = y.Value.NodesDict.ToDictionary(x => x.Key, x => x.Value.Value ?? "");
+			}
+			
+			var translations = new Dictionary<string, string>();
+			foreach (var tkv in defaultTranslations.Concat(selectedTranslations))
+			{
+				if (translations.ContainsKey(tkv.Key))
+					continue;
+				if (selectedTranslations.ContainsKey(tkv.Key))
+					translations.Add(tkv.Key, selectedTranslations[tkv.Key]);
+				else
+					translations.Add(tkv.Key, tkv.Value);
+			}
+
+			FieldLoader.Translations = translations;
+		}
+
 		public Map PrepareMap(string uid)
 		{
 			LoadScreen.Display();
@@ -78,6 +120,8 @@ namespace OpenRA
 				throw new InvalidDataException("Invalid map uid: {0}".F(uid));
 			var map = new Map(AvailableMaps[uid].Path);
 
+			LoadTranslations(map);
+
 			// Reinit all our assets
 			InitializeLoaders();
 			FileSystem.LoadFromManifest(Manifest);

OpenRA.Game/Widgets/ButtonWidget.cs

@@ -25,7 +25,7 @@ namespace OpenRA.Widgets
 			set { GetKey = _ => value; }
 		}
 
-		public string Text = "";
+		[Translate] public string Text = "";
 		public bool Depressed = false;
 		public int VisualHeight = ChromeMetrics.Get<int>("ButtonDepth");
 		public string Font = ChromeMetrics.Get<string>("ButtonFont");

OpenRA.Game/Widgets/LabelWidget.cs

@@ -10,6 +10,7 @@
 
 using System;
 using System.Drawing;
+using OpenRA.FileFormats;
 using OpenRA.Graphics;
 
 namespace OpenRA.Widgets
@@ -19,7 +20,7 @@ namespace OpenRA.Widgets
 
 	public class LabelWidget : Widget
 	{
-		public string Text = null;
+		[Translate] public string Text = null;
 		public TextAlign Align = TextAlign.Left;
 		public TextVAlign VAlign = TextVAlign.Middle;
 		public string Font = "Regular";