gnucash maint: Fix minor I18n issues

[Frank H. Ellenberger]

Updated	 via  https://github.com/Gnucash/gnucash/commit/3f905e73 (commit)
	from  https://github.com/Gnucash/gnucash/commit/ca7935f4 (commit)



commit 3f905e73c657cf4e545cc43d8d775ce5db4ca986
Author: Frank H. Ellenberger <frank.h.ellenberger at gmail.com>
Date:   Fri Mar 20 22:00:32 2015 +0100

    Fix minor I18n issues
    
    Follow up of ec8fc42:
    Empty strings should not be marked for translation.
    Mark "Thank you ..." for translation
    
    Unify "Thank you ..." between different invoices



Summary of changes:
 src/report/business-reports/easy-invoice.scm  | 2 +-
 src/report/business-reports/fancy-invoice.scm | 2 +-
 src/report/business-reports/invoice.scm       | 2 +-
 src/report/business-reports/taxinvoice.scm    | 4 ++--
 4 files changed, 5 insertions(+), 5 deletions(-)