set: Fix GetAvailableLanguageCodes implementation.

src/core/hle/service/set/set.h

@@ -8,6 +8,27 @@
 
 namespace Service::Set {
 
+/// This is "nn::settings::LanguageCode", which is a NUL-terminated string stored in a u64.
+enum class LanguageCode : u64 {
+    JA = 0x000000000000616A,
+    EN_US = 0x00000053552D6E65,
+    FR = 0x0000000000007266,
+    DE = 0x0000000000006564,
+    IT = 0x0000000000007469,
+    ES = 0x0000000000007365,
+    ZH_CN = 0x0000004E432D687A,
+    KO = 0x0000000000006F6B,
+    NL = 0x0000000000006C6E,
+    PT = 0x0000000000007470,
+    RU = 0x0000000000007572,
+    ZH_TW = 0x00000057542D687A,
+    EN_GB = 0x00000042472D6E65,
+    FR_CA = 0x00000041432D7266,
+    ES_419 = 0x00003931342D7365,
+    ZH_HANS = 0x00736E61482D687A,
+    ZH_HANT = 0x00746E61482D687A,
+};
+
 class SET final : public ServiceFramework<SET> {
 public:
     explicit SET();