Properly set the supported language, user language, and region based on the ROM's region (#38)

arm7/source/loader/UserLanguage.h

@@ -0,0 +1,14 @@
+#pragma once
+
+/// @brief Enum for DSi user language.
+enum class UserLanguage
+{
+    Japanese,
+    English,
+    French,
+    German,
+    Italian,
+    Spanish,
+    Chinese,
+    Korean
+};