revert sth and add comment to explain

src/conversation_textview.py

@@ -562,7 +562,8 @@ class ConversationTextview(gtk.TextView):
 				day_str = _('Yesterday')
 			else:
 				#the number is >= 2
-				day_str = _('%d days ago') % diff_day
+				# %i is day in year (1-365), %d (1-31) we want %i
+				day_str = _('%i days ago') % diff_day
 			format = before_str
 			if day_str:
 				format += day_str + ' '