Re-add Korean language option

Korean has recently been fully updated by a group of dedicated
translators.  This adds the official menu entry.

Also remove Catalan as it hasn't been maintained during v6

common/pgm_base.cpp

@@ -71,7 +71,6 @@ LANGUAGE_DESCR LanguagesList[] =
 {
     { wxLANGUAGE_DEFAULT,    ID_LANGUAGE_DEFAULT,    _( "Default" ),    false },
     { wxLANGUAGE_INDONESIAN, ID_LANGUAGE_INDONESIAN, wxT( "Bahasa Indonesia" ), true },
-    { wxLANGUAGE_CATALAN,    ID_LANGUAGE_CATALAN,    wxT( "Català" ),   true },
     { wxLANGUAGE_CZECH,      ID_LANGUAGE_CZECH,      wxT( "Čeština" ),  true },
     { wxLANGUAGE_DANISH,     ID_LANGUAGE_DANISH,     wxT( "Dansk" ),    true },
     { wxLANGUAGE_GERMAN,     ID_LANGUAGE_GERMAN,     wxT( "Deutsch" ),  true },
@@ -79,6 +78,7 @@ LANGUAGE_DESCR LanguagesList[] =
     { wxLANGUAGE_ENGLISH,    ID_LANGUAGE_ENGLISH,    wxT( "English" ),  true },
     { wxLANGUAGE_SPANISH,    ID_LANGUAGE_SPANISH,    wxT( "Español" ),  true },
     { wxLANGUAGE_FRENCH,     ID_LANGUAGE_FRENCH,     wxT( "Français" ), true },
+    { wxLANGUAGE_KOREAN,     ID_LANGUAGE_KOREAN,     wxT( "한국인"),       true },
     { wxLANGUAGE_ITALIAN,    ID_LANGUAGE_ITALIAN,    wxT( "Italiano" ), true },
     { wxLANGUAGE_LITHUANIAN, ID_LANGUAGE_LITHUANIAN, wxT( "Lietuvių" ), true },
     { wxLANGUAGE_HUNGARIAN,  ID_LANGUAGE_HUNGARIAN,  wxT( "Magyar" ),   true },