feat(libSceSystemService): map Slavic and Nordic locales

Russian, Ukrainian, Polish, Czech, Finnish, Swedish and Danish map to their
console language. Norwegian is the console's one Norwegian language, so no,
nb (Bokmal) and nn (Nynorsk) all map to it. Lithuanian, Latvian, Estonian and
the other Slavic languages the console has no entry for stay unrecognised.

core/libs/prx/libSceSystemService/LanguageLocale.hpp

@@ -150,11 +150,25 @@ inline constexpr Row JapaneseKoreanRows[] = {
     {"ko", "", "", Korean},
 };
 
+inline constexpr Row SlavicNordicRows[] = {
+    {"ru", "", "", Russian},
+    {"uk", "", "", Ukrainian},
+    {"pl", "", "", Polish},
+    {"cs", "", "", Czech},
+    {"fi", "", "", Finnish},
+    {"sv", "", "", Swedish},
+    {"da", "", "", Danish},
+    {"no", "", "", Norwegian},
+    {"nb", "", "", Norwegian},
+    {"nn", "", "", Norwegian},
+};
+
 inline constexpr std::span<const Row> RowGroups[] = {
     LatinEuropeanRows,
     IberianRows,
     ChineseRows,
     JapaneseKoreanRows,
+    SlavicNordicRows,
 };
 
 }