Actually, Hungarian did appear in my Plus! 5.0 settings too. Only after manually deleting all files in the Languages folder and installing Plus! 5.0 it disappeared. Obviously it is some old Hungarian language file from the time when it was still bundled with the setup (I never installed any language file manually
, except for Dutch when Cookie sends a new one every day). Isn't the compatibility level supposed to hide outdated language files from the settings? If it doesn't this could be creating problems for more old languages.
This Hungarian language file was sitting in my Languages folder (and showing up in the Plus! 5.0 settings GUI):
http://rnd.menthix.net/mpl_files/Lng_Hungarian.ini