new encoding (UTF8) is incompatible with the encoding of the template database (SQL_ASCII)

Dear all of you,

I'm currently working on a centos that I manage with webmin.
A sI try to create a DB with unicode encoding the following message is
returned to me :

new encoding (UTF8) is incompatible with the encoding of the
template database (SQL_ASCII)

After a little googling, I felt happy because the solution seems easy to
create a new utf8 db :
createdb -E UTF8 -T template0 myDB

Unfortunately, I would like to create a default template database in UTF
or accepting all others encoding.

Your help would be usefull,

Best regards,

Florent THOMAS