man.output.lang.in.name.enabled — Include $LANG value in man-page filename/pathname?
The man.output.lang.in.name.enabled
  parameter specifies whether a $lang value is
  included in man-page filenames and pathnames.
If the value of
  man.output.lang.in.name.enabled is non-zero,
  man-page files are output with the $lang value
  included in their filenames or pathnames as follows;
  
if man.output.subdirs.enabled is
      non-zero, each file is output to, e.g., a
      man/
      pathname$lang/man8/foo.8
if man.output.subdirs.enabled is
      zero, each file is output with a
      foo.
      filename$lang.8