Mark non-moddable translation strings as constant.

OpenRA.Mods.Common/Traits/Player/DeveloperMode.cs

@@ -72,6 +72,9 @@ namespace OpenRA.Mods.Common.Traits
 
 	public class DeveloperMode : IResolveOrder, ISync, INotifyCreated, IUnlocksRenderPlayer
 	{
+		[TranslationReference("cheat", "player", "suffix")]
+		const string CheatUsed = "cheat-used";
+
 		readonly DeveloperModeInfo info;
 		public bool Enabled { get; private set; }
 
@@ -106,9 +109,6 @@ namespace OpenRA.Mods.Common.Traits
 
 		bool enableAll;
 
-		[TranslationReference("cheat", "player", "suffix")]
-		static readonly string CheatUsed = "cheat-used";
-
 		public DeveloperMode(DeveloperModeInfo info)
 		{
 			this.info = info;