Bug#856047: locale-gen manpage is not up-to-date
Manpage of locale-gen does not mention the --keep-existing option. In
the source I see there is locale-gen.8.sgml, which has this option,
but apparently it is not used for generating locale-gen.8, and these
two files are now out-of-sync. If you prefer to keep using
locale-gen.8, I suggest to remove the sgml file from git to avoid
confusion, otherwise we should keep the sgml file up-to-date. I can
send a patch to fix this if you let me know which way is preferred.