Async initialization for DateFormat

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

Index: pkg/intl/data/dates/symbols/hr.json
===================================================================
--- pkg/intl/data/dates/symbols/hr.json	(revision 0)
+++ pkg/intl/data/dates/symbols/hr.json	(revision 0)
@@ -0,0 +1 @@
+{"DATEFORMATS":["EEEE, d. MMMM y.","d. MMMM y.","d. M. y.","d.M.y."],"NARROWWEEKDAYS":["N","P","U","S","Č","P","S"],"STANDALONESHORTMONTHS":["sij","velj","ožu","tra","svi","lip","srp","kol","ruj","lis","stu","pro"],"ERANAMES":["Prije Krista","Poslije Krista"],"FIRSTWEEKCUTOFFDAY":6,"NARROWMONTHS":["1.","2.","3.","4.","5.","6.","7.","8.","9.","10.","11.","12."],"STANDALONESHORTWEEKDAYS":["ned","pon","uto","sri","čet","pet","sub"],"FIRSTDAYOFWEEK":0,"STANDALONEWEEKDAYS":["nedjelja","ponedjeljak","utorak","srijeda","četvrtak","petak","subota"],"WEEKDAYS":["nedjelja","ponedjeljak","utorak","srijeda","četvrtak","petak","subota"],"QUARTERS":["1. kvartal","2. kvartal","3. kvartal","4. kvartal"],"ERAS":["p. n. e.","A. D."],"MONTHS":["siječnja","veljače","ožujka","travnja","svibnja","lipnja","srpnja","kolovoza","rujna","listopada","studenoga","prosinca"],"TIMEFORMATS":["HH:mm:ss zzzz","HH:mm:ss z","HH:mm:ss","HH:mm"],"SHORTWEEKDAYS":["ned","pon","uto","sri","čet","pet","sub"],"SHORTQUARTERS":["1kv","2kv","3kv","4kv"],"WEEKENDRANGE":[5,6],"STANDALONENARROWWEEKDAYS":["n","p","u","s","č","p","s"],"AVAILABLEFORMATS":null,"NAME":"hr","AMPMS":["AM","PM"],"STANDALONEMONTHS":["siječanj","veljača","ožujak","travanj","svibanj","lipanj","srpanj","kolovoz","rujan","listopad","studeni","prosinac"],"SHORTMONTHS":["sij","velj","ožu","tra","svi","lip","srp","kol","ruj","lis","stu","pro"],"STANDALONENARROWMONTHS":["1.","2.","3.","4.","5.","6.","7.","8.","9.","10.","11.","12."]}