gnucash maint: Update LINGUAS explanation to the last version we had in autotools

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/295f8e38 (commit)
	from  https://github.com/Gnucash/gnucash/commit/d9ed8475 (commit)



commit 295f8e38d863604aee720a72cac5bddff3e7b878
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Wed Oct 17 07:33:38 2018 +0200

    Update LINGUAS explanation to the last version we had in autotools



Summary of changes:
 po/CMakeLists.txt | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)