Simple QDate::longMonthName(..) won't do the job as it
will return the month name using LC_DATE locale which is used
for date formatting etc. So for example, in en_US locale
and cs_CZ LC_DATE, it would return Czech month names while
it should return English ones. So here we force the first ui
language locale and take the month name from that.
BUG: 353715
REVIEW: 125705
6f3fed77d5