This file is indexed.

/usr/share/tex-common/language.dat.header is in tex-common 2.10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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% header of the configuration file for language.dat
%
% In Debian, language.dat is a file that is generated from
% configuration files in /etc/texmf/hyphen.d/.  
%
% The text of the comments is Copyright 1998, 1999 by Thomas Esser, it
% is in the Public domain.


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%  To make it possible for package scripts to parse this file, 
%%  please use only "%! " to comment out hyphenation patterns!
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% CAUTION: the first language will be the default if no style-file
%          (e.g. german.sty) is used.
% Since version 3.0 of TeX, hyphenation patterns for multiple languages are
% possible. Unless you know what you are doing, please let the american
% english patterns be the first ones. The babel system allows you to
% easily change the active language for your texts. For more information,
% have a look to the documentation in texmf/doc/generic/babel.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% The hyphenation pattern files are in the directory:
%       texmf/tex/generic/hyphen
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%