Hong Kong people expect to use a little endian date in English. (and a
big endian date in Chinese)
The D_FMT format string for en_HK is '%A, %B %d, %Y', which the current
code parses as middle endian.
This commit makes the code parse it as little endian, that is it doesn't
ignore the %A formatter any more.
en_HK is the only UTF-8 locale with this D_FMT format string, so this
shouldn't change anything for other locales.
https://bugzilla.gnome.org/show_bug.cgi?id=750781
623abfb428