Async initialization for DateFormat

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

Index: pkg/intl/data/dates/symbols/hu.json
===================================================================
--- pkg/intl/data/dates/symbols/hu.json	(revision 0)
+++ pkg/intl/data/dates/symbols/hu.json	(revision 0)
@@ -0,0 +1 @@
+{"DATEFORMATS":["y. MMMM d., EEEE","y. MMMM d.","yyyy.MM.dd.","yyyy.MM.dd."],"NARROWWEEKDAYS":["V","H","K","Sz","Cs","P","Sz"],"STANDALONESHORTMONTHS":["jan.","febr.","márc.","ápr.","máj.","jún.","júl.","aug.","szept.","okt.","nov.","dec."],"ERANAMES":["időszámításunk előtt","időszámításunk szerint"],"FIRSTWEEKCUTOFFDAY":6,"NARROWMONTHS":["J","F","M","Á","M","J","J","Á","Sz","O","N","D"],"STANDALONESHORTWEEKDAYS":["V","H","K","Sze","Cs","P","Szo"],"FIRSTDAYOFWEEK":0,"STANDALONEWEEKDAYS":["vasárnap","hétfő","kedd","szerda","csütörtök","péntek","szombat"],"WEEKDAYS":["vasárnap","hétfő","kedd","szerda","csütörtök","péntek","szombat"],"QUARTERS":["I. negyedév","II. negyedév","III. negyedév","IV. negyedév"],"ERAS":["i. e.","i. sz."],"MONTHS":["január","február","március","április","május","június","július","augusztus","szeptember","október","november","december"],"TIMEFORMATS":["H:mm:ss zzzz","H:mm:ss z","H:mm:ss","H:mm"],"SHORTWEEKDAYS":["V","H","K","Sze","Cs","P","Szo"],"SHORTQUARTERS":["N1","N2","N3","N4"],"WEEKENDRANGE":[5,6],"STANDALONENARROWWEEKDAYS":["V","H","K","Sz","Cs","P","Sz"],"AVAILABLEFORMATS":null,"NAME":"hu","AMPMS":["de.","du."],"STANDALONEMONTHS":["január","február","március","április","május","június","július","augusztus","szeptember","október","november","december"],"SHORTMONTHS":["jan.","febr.","márc.","ápr.","máj.","jún.","júl.","aug.","szept.","okt.","nov.","dec."],"STANDALONENARROWMONTHS":["J","F","M","Á","M","J","J","A","Sz","O","N","D"]}