Throw error when invalid locale is detected

Author: mdX7

WowPacketParser/Misc/ClientLocale.cs

@@ -25,6 +25,9 @@ public static void SetLocale(string locale)
                 PacketLocaleString = "enUS";
             else
                 PacketLocaleString = locale;
+
+            if (!Enum.TryParse<LocaleConstant>(PacketLocaleString, out var _))
+                throw new InvalidDataException($"Invalid locale '{PacketLocaleString}'.");
         }
     }
 }