gnucash maint: I18N: Fix several issuse with 'Help not found' strings

[Frank H.Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/e84e6806 (commit)
	from  https://github.com/Gnucash/gnucash/commit/79286d92 (commit)



commit e84e680603b225cb52be6981840b80291ef8352b
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Sat May 9 01:51:05 2020 +0200

    I18N: Fix several issuse with 'Help not found' strings
    
    Unify and modularize the strings
    Add an unmarked string



Summary of changes:
 gnucash/gnome-utils/gnc-gnome-utils.c | 30 ++++++++++++++----------------
 1 file changed, 14 insertions(+), 16 deletions(-)