Async initialization for DateFormat

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

Index: pkg/intl/data/dates/symbols/lt.json
===================================================================
--- pkg/intl/data/dates/symbols/lt.json	(revision 0)
+++ pkg/intl/data/dates/symbols/lt.json	(revision 0)
@@ -0,0 +1 @@
+{"DATEFORMATS":["y 'm'. MMMM d 'd'., EEEE","y 'm'. MMMM d 'd'.","y MMM d","yyyy-MM-dd"],"NARROWWEEKDAYS":["S","P","A","T","K","P","Š"],"STANDALONESHORTMONTHS":["Saus.","Vas.","Kov.","Bal.","Geg.","Bir.","Liep.","Rugp.","Rugs.","Spal.","Lapkr.","Gruod."],"ERANAMES":["prieš Kristų","po Kristaus"],"FIRSTWEEKCUTOFFDAY":3,"NARROWMONTHS":["S","V","K","B","G","B","L","R","R","S","L","G"],"STANDALONESHORTWEEKDAYS":["Sk","Pr","An","Tr","Kt","Pn","Št"],"FIRSTDAYOFWEEK":0,"STANDALONEWEEKDAYS":["sekmadienis","pirmadienis","antradienis","trečiadienis","ketvirtadienis","penktadienis","šeštadienis"],"WEEKDAYS":["sekmadienis","pirmadienis","antradienis","trečiadienis","ketvirtadienis","penktadienis","šeštadienis"],"QUARTERS":["I ketvirtis","II ketvirtis","III ketvirtis","IV ketvirtis"],"ERAS":["pr. Kr.","po Kr."],"MONTHS":["sausio","vasaris","kovas","balandis","gegužė","birželis","liepa","rugpjūtis","rugsėjis","spalis","lapkritis","gruodis"],"TIMEFORMATS":["HH:mm:ss zzzz","HH:mm:ss z","HH:mm:ss","HH:mm"],"SHORTWEEKDAYS":["Sk","Pr","An","Tr","Kt","Pn","Št"],"SHORTQUARTERS":["I k.","II k.","III k.","IV ketv."],"WEEKENDRANGE":[5,6],"STANDALONENARROWWEEKDAYS":["S","P","A","T","K","P","Š"],"AVAILABLEFORMATS":null,"NAME":"lt","AMPMS":["priešpiet","popiet"],"STANDALONEMONTHS":["Sausis","Vasaris","Kovas","Balandis","Gegužė","Birželis","Liepa","Rugpjūtis","Rugsėjis","Spalis","Lapkritis","Gruodis"],"SHORTMONTHS":["Saus.","Vas","Kov.","Bal.","Geg.","Bir.","Liep.","Rugp.","Rugs.","Spal.","Lapkr.","Gruod."],"STANDALONENARROWMONTHS":["S","V","K","B","G","B","L","R","R","S","L","G"]}