Async initialization for DateFormat

pkg/intl/data/dates/symbols/ru.json

Index: pkg/intl/data/dates/symbols/ru.json
===================================================================
--- pkg/intl/data/dates/symbols/ru.json	(revision 0)
+++ pkg/intl/data/dates/symbols/ru.json	(revision 0)
@@ -0,0 +1 @@
+{"DATEFORMATS":["EEEE, d MMMM y 'г'.","d MMMM y 'г'.","dd.MM.yyyy","dd.MM.yy"],"NARROWWEEKDAYS":["В","Пн","Вт","С","Ч","П","С"],"STANDALONESHORTMONTHS":["Янв.","Февр.","Март","Апр.","Май","Июнь","Июль","Авг.","Сент.","Окт.","Нояб.","Дек."],"ERANAMES":["до н.э.","н.э."],"FIRSTWEEKCUTOFFDAY":6,"NARROWMONTHS":["Я","Ф","М","А","М","И","И","А","С","О","Н","Д"],"STANDALONESHORTWEEKDAYS":["Вс","Пн","Вт","Ср","Чт","Пт","Сб"],"FIRSTDAYOFWEEK":0,"STANDALONEWEEKDAYS":["Воскресенье","Понедельник","Вторник","Среда","Четверг","Пятница","Суббота"],"WEEKDAYS":["воскресенье","понедельник","вторник","среда","четверг","пятница","суббота"],"QUARTERS":["1-й квартал","2-й квартал","3-й квартал","4-й квартал"],"ERAS":["до н.э.","н.э."],"MONTHS":["января","февраля","марта","апреля","мая","июня","июля","августа","сентября","октября","ноября","декабря"],"TIMEFORMATS":["H:mm:ss zzzz","H:mm:ss z","H:mm:ss","H:mm"],"SHORTWEEKDAYS":["вс","пн","вт","ср","чт","пт","сб"],"SHORTQUARTERS":["1-й кв.","2-й кв.","3-й кв.","4-й кв."],"WEEKENDRANGE":[5,6],"STANDALONENARROWWEEKDAYS":["В","П","В","С","Ч","П","С"],"AVAILABLEFORMATS":null,"NAME":"ru","AMPMS":["до полудня","после полудня"],"STANDALONEMONTHS":["Январь","Февраль","Март","Апрель","Май","Июнь","Июль","Август","Сентябрь","Октябрь","Ноябрь","Декабрь"],"SHORTMONTHS":["янв.","февр.","марта","апр.","мая","июня","июля","авг.","сент.","окт.","нояб.","дек."],"STANDALONENARROWMONTHS":["Я","Ф","М","А","М","И","И","А","С","О","Н","Д"]}