Subtitle appearing in Acm Reference Format

I'm writing an article for ACM Conference and I'm using portuguese as main language. In this specific Conference they allow it but I have to write two titles, the first in english and the second in portuguese. The main problem is that in "box" Acm Reference Format I need show only the english title, however as this is generated automatically, it compiled the two titles. I'm writing like this:

\begin{document}

\title{Hermes: A Natural Language Interface Model for Software Transformation}

\subtitle{Hermes: Um Modelo de Interface de Linguagem Natural para Transformação em Software
}


Can you help me with this problem?

\title{Hermes: A Natural Language Interface Model for Software Transformation}