%------------------------------------------------------------------------------

\begin{frame}
  %%LANGUAGE en \frametitle{... title ...}
  %%LANGUAGE lt \frametitle{... antraštė ...}

  %%BEGIN LANGUAGE en
  %%END LANGUAGE en

  %%BEGIN LANGUAGE lt
  %%END LANGUAGE lt

  \begin{itemize}
    %%BEGIN LANGUAGE en
  \item an item ...
  \item one more item ...
    %%END LANGUAGE en
    %%BEGIN LANGUAGE lt
  \item vienas pukktas ...
  \item dar vienas punktas ...
    %%END LANGUAGE lt
  \end{itemize}

\end{frame}