gnucash maint: Update translations from the translation project.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/9303d7dd (commit)
	from  https://github.com/Gnucash/gnucash/commit/53b45262 (commit)



commit 9303d7dd0c8c44c6102ee3888f455f31ad4c56d5
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Jun 24 15:47:42 2016 -0700

    Update translations from the translation project.
    
    Updated: Dutch, Serbian



Summary of changes:
 po/nl.po | 11932 ++++++++++++++++++++++++++++++------------------------------
 po/sr.po | 11991 +++++++++++++++++++++++++++++++------------------------------
 2 files changed, 12012 insertions(+), 11911 deletions(-)