Previous list was actually wrong. Previously it3 and it4 voices were configured,
but now there are entries for all four voices.

There are small differences for diphone sets, but these are not used
from eSpeak NG.

The custom n vowel in ph_english did not specify a lengthmod and
the call to the base n did not set that value.

A new 'hyw' language code has been registered for Western Armenian,
and the arevela and arevmda variant subtags have been deprecated.

This still accepts the hy-arevela and hy-arevmda language tags, but
uses the preferred names for the language files.