\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage{german,calc,txfonts,graphicx}

\newcommand{\maerchentitel}{\section}
\newcommand{\untertitel}{\subsection}
\newcommand{\response}{\hspace{1.5em}}
\newcommand{\verseinsideindent}{\hspace{1.5em}}
\newcommand{\oqs}{\glqq}
\newcommand{\cqs}{\grqq}
\newcommand{\divisionbar}{\begin{center}\rule[0.5ex]{0.25\textwidth}{0.1ex}\end{center}}
\newcommand{\titleunderbar}{\begin{center}\rule[0.5ex]{0.25\textwidth}{0.1ex}\end{center}}
\newcommand{\almostfullbar}{\begin{center}\rule[0.5ex]{0.9\textwidth}{0.1ex}\end{center}}
\makeatletter
\renewcommand*\l@section[2]{%
  \ifnum \c@tocdepth >\z@
    \addpenalty\@secpenalty
    \addvspace{1.0em \@plus\p@}%
    \setlength\@tempdima{2.5em}%
    \begingroup
      \parindent \z@ \rightskip \@pnumwidth
      \parfillskip -\@pnumwidth
      \leavevmode \bfseries
      \advance\leftskip\@tempdima
      \hskip -\leftskip
      #1\nobreak\hfil \nobreak\hb@xt@\@pnumwidth{\hss #2}\par
    \endgroup
  \fi}
\makeatother
\pagestyle{headings}
\begin{document}
\tableofcontents
\thispagestyle{empty}
	\input bg_khm_kl-ausg_1833_01.txt
	\input bg_khm_kl-ausg_1833_02.txt
% ......
	\input bg_khm_kl-ausg_1833_50.txt
\end{document}