Extra text on the title slide

Sometimes it might be necessary to add some extra information to the title slide e.g., conference title, other companies' details, etc. One could add a node in the beamerouterthemetuhh.sty like:

% Title
\node[outer sep=0, inner sep=0, anchor=west] (title) at (0, \the\paperheight-48mm) {%
  \parbox[c][40mm]{132.19mm}{%
  \raggedright
  \usebeamercolor{tuhh teal}\color{fg}%
  \usebeamerfont{title}%
  \inserttitle}%
};
% Extra header 
\node[outer sep=0, inner sep=0, anchor=west] (extra header) at (164mm, \the\paperheight-48mm) {%
  \parbox[c][40mm]{132.19mm}{%
  \raggedright
  \usebeamercolor{tuhh teal}\color{fg}%
  \usebeamerfont{title}%
   <your text>}%
};

However, <your text> has to be parametrizable.