The advanced version the validator page

  <http://validator.w3.org:8001/detailed.html>

allows selecting a character encoding. In the list of available
encodings is "iso-8859-3 (Maltese)". That encoding is however not just
for Maltese. It is also for Esperanto and Turkish. In my experience it
is nowadays used mostly for Esperanto, probably a lot more for Esperanto
than for Maltese, and hardly ever for Turkish.

Mozilla calls it "Southern European". In the list of encodings in the
validator interface perhaps "Southern Europe" would fit in well after
"Western Europe" and "Central Europe". But "Esperanto, Maltese" would
probably be a better choice. If only one language can be mentioned, then
the one most often used with "iso-8859-3" should be the one mentioned.