12.4.2 `LINGUAS' in `po/'
The `po/' directory should also receive a file named
`LINGUAS'. This file contains the list of available translations.
It is a whitespace separated list. Hash-marked comments and white lines
are ignored. Here is an example file:
# Set of available languages.
This example means that German and French PO files are available, so
that these languages are currently supported by your package. If you
want to further restrict, at installation time, the set of installed
languages, this should not be done by modifying the `LINGUAS' file,
but rather by using the
LINGUAS environment variable
(see section 9.2 Magic for Installers).