Moved relevant application layer enums and value objects to the domain layer.

JSMR.Domain/Enums/Language.cs

@@ -0,0 +1,11 @@
+namespace JSMR.Domain.Enums;
+
+public enum Language
+{
+    Unknown = -1,
+    Japanese = 0,
+    English = 1,
+    ChineseSimplified = 2,
+    ChineseTraditional = 3,
+    Korean = 4
+}