text_template.tex

\documentclass[12pt]{beamer}

\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage[OT6,T1]{fontenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{dsfont}
\usepackage{setspace}
\usepackage{tipa}
\usepackage{relsize}
\usepackage{textcomp}

\newcommand{\armenian}{\fontencoding{OT6}\fontfamily{cmr}\selectfont}
\DeclareTextFontCommand{\textarmenian}{\armenian}
\newcommand{\english}{\fontencoding{T1}\fontfamily{cmr}\selectfont}
\DeclareTextFontCommand{\textenglish}{\english}

\newenvironment{myfont}{\fontencoding{OT6}\fontfamily{cmr}\selectfont}{\par}

\mode<presentation>
{
  \usetheme{default}      % or try Darmstadt, Madrid, Warsaw, ...
  \usecolortheme{default} % or try albatross, beaver, crane, ...
  \usefonttheme{serif}  % or try serif, structurebold, ...
  \setbeamertemplate{navigation symbols}{}
  \setbeamertemplate{caption}[numbered]
}
\begin{document}
\begin{myfont}

\begin{frame}
    YourTextHere
\end{frame}

\end{myfont}
\end{document}