Refactor translation files

- Add prefixes to all message keys to provide context
- Use messages with attributes for some UI elements (dropdowns, dialogs, checkboxes, menus)
- Rename some class fields for consistency with translation keys

OpenRA.Game/Server/PlayerMessageTracker.cs

@@ -17,7 +17,7 @@ namespace OpenRA.Server
 	class PlayerMessageTracker
 	{
 		[TranslationReference("remaining")]
-		const string ChatTemporaryDisabled = "chat-temp-disabled";
+		const string ChatTemporaryDisabled = "notification-chat-temp-disabled";
 
 		readonly Dictionary<int, List<long>> messageTracker = new Dictionary<int, List<long>>();
 		readonly Server server;