For some reason, “New” has been translated as “Nieuw” in Bulgarian, but
this is not Bulgarian, this is Dutch.

This commit replaces all occurrences of “Nieuw” with “Нов”, which is the
correct translation for “New” in Bulgarian.

closes odoo/odoo#133582

Related: odoo/enterprise#46542
Signed-off-by: Louis Wicket (wil) <wil@odoo.com>