Right way to support locale

[Jose M Rodriguez]

Hi,

After some digging, I found that recent Aviary MoFo products supports 
the intl.locale.matchOS pref (in general, defined false).

I'll glad to know if this is working for other locale setting (tested 
for es-ES in firefox/nvu/thunderbird).

Also, thinking in make intl.locale.matchOS true by default on FreeBSD 
ports.

This'll be a better aproach that the actual need of define 
MOZILLA_UILOCALE env

--
  josemi