Author: John Ralls <[hidden email]>
Date: Sat Jan 19 13:41:17 2019 -0800
Fix unlocalized date in status bar.
It seems that std::locales created by boost::locale::generator are
not entirely compatible: If used to create a new locale with a facet
for boost::date_time one ends up with the C locale and the facet.
For the time being avoid the problem by using boost::locale to format
dates and times. std::chrono gets calendar functions in C++20 so we
can switch date-time backends once we can adopt it.