Async initialization for DateFormat

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

Index: pkg/intl/data/dates/symbols/af.json
===================================================================
--- pkg/intl/data/dates/symbols/af.json	(revision 0)
+++ pkg/intl/data/dates/symbols/af.json	(revision 0)
@@ -0,0 +1 @@
+{"DATEFORMATS":["EEEE dd MMMM y","dd MMMM y","dd MMM y","yyyy-MM-dd"],"NARROWWEEKDAYS":["S","M","D","W","D","V","S"],"STANDALONESHORTMONTHS":["Jan","Feb","Mar","Apr","Mei","Jun","Jul","Aug","Sep","Okt","Nov","Des"],"ERANAMES":["voor Christus","na Christus"],"FIRSTWEEKCUTOFFDAY":5,"NARROWMONTHS":["J","F","M","A","M","J","J","A","S","O","N","D"],"STANDALONESHORTWEEKDAYS":["So","Ma","Di","Wo","Do","Vr","Sa"],"FIRSTDAYOFWEEK":6,"STANDALONEWEEKDAYS":["Sondag","Maandag","Dinsdag","Woensdag","Donderdag","Vrydag","Saterdag"],"WEEKDAYS":["Sondag","Maandag","Dinsdag","Woensdag","Donderdag","Vrydag","Saterdag"],"QUARTERS":["1ste kwartaal","2de kwartaal","3de kwartaal","4de kwartaal"],"ERAS":["v.C.","n.C."],"MONTHS":["Januarie","Februarie","Maart","April","Mei","Junie","Julie","Augustus","September","Oktober","November","Desember"],"TIMEFORMATS":["h:mm:ss a zzzz","h:mm:ss a z","h:mm:ss a","h:mm a"],"SHORTWEEKDAYS":["So","Ma","Di","Wo","Do","Vr","Sa"],"SHORTQUARTERS":["K1","K2","K3","K4"],"WEEKENDRANGE":[5,6],"STANDALONENARROWWEEKDAYS":["S","M","D","W","D","V","S"],"AVAILABLEFORMATS":null,"NAME":"af","AMPMS":["vm.","nm."],"STANDALONEMONTHS":["Januarie","Februarie","Maart","April","Mei","Junie","Julie","Augustus","September","Oktober","November","Desember"],"SHORTMONTHS":["Jan","Feb","Mar","Apr","Mei","Jun","Jul","Aug","Sep","Okt","Nov","Des"],"STANDALONENARROWMONTHS":["J","F","M","A","M","J","J","A","S","O","N","D"]}