gnucash maint: Add a translator comment about invoice title format

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/38abaf30 (commit)
	from  https://github.com/Gnucash/gnucash/commit/4b5ee845 (commit)



commit 38abaf305a4b13867f64aea333092af6cf0f284c
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Fri Nov 2 23:16:52 2018 +0100

    Add a translator comment about invoice title format



Summary of changes:
 gnucash/report/business-reports/invoice.scm | 3 +++
 1 file changed, 3 insertions(+)