\documentclass{article}
\usepackage[czech]{babel}
%\usepackage[slovak]{babel}
%\usepackage[english]{babel}
\usepackage{longtable}
\begin{document}
\begin{longtable}{l|l}
top left & top right\\
\cline{1-1}
bottom left & bottom right
\end{longtable}
\end{document}