Replace F extension with string interpolation

OpenRA.Mods.Common/Lint/CheckVoiceReferences.cs

@@ -67,7 +67,7 @@ namespace OpenRA.Mods.Common.Lint
 							continue;
 
 						if (!soundInfo.Voices.Keys.Contains(voice))
-							emitError("Actor {0} using voice set {1} does not define {2} voice required by {3}.".F(actorInfo.Name, voiceSet, voice, traitInfo));
+							emitError($"Actor {actorInfo.Name} using voice set {voiceSet} does not define {voice} voice required by {traitInfo}.");
 					}
 				}
 			}