6595, 5621: temp workaround for xgettext bug (not yet fixed on GNU gettext 0.18.2), see https://savannah.gnu.org/bugs/index.php?29216

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@22204 4ae1f11a-8b86-4847-b8af-ab372f36d1fd