Add HTML lang head tag (#429)
Add HTML lang head tag (#429)

Refs #286 
eduardochiaro/Casper-Light,alvareztech/Casper,rkalis/roscasper,sawilde/Casper,TryGhost/Casper,tiagocasanovapt/Casper,Mr-Zer0/yansnote,matitalatina/Casper,russmckendrick/Casper,dlecina/StayPuft,eidolem/casper,jedidja/Casper,matitalatina/Casper,ErisDS/Casper,sawilde/Casper,netputer/Casper,dlecina/StayPuft,Mr-Zer0/yansnote,ErisDS/Casper,AaronLenoir/Casper,dlew/Casper,jedidja/Casper,Inchdev/blog-theme,eduardochiaro/Casper-Light,rkalis/roscasper,ImKcat/ImKcatCasper,Inchdev/blog-theme,eidolem/casper,AaronLenoir/Casper,tiagocasanovapt/Casper,alvareztech/Casper