unicode literals for {} formats

gramps/gui/editors/editdate.py

@@ -34,6 +34,8 @@ The DateEditor provides a dialog in which the date can be
 unambiguously built using UI controls such as menus and spin buttons.
 """
 
+from __future__ import unicode_literals
+
 #-------------------------------------------------------------------------
 #
 # Python modules

gramps/plugins/drawreport/calendarreport.py

@@ -26,6 +26,7 @@
 # python modules
 #
 #------------------------------------------------------------------------
+from __future__ import unicode_literals
 from functools import partial
 import datetime
 import time