Normalize locale codes to xx_YY
Normalize locale codes to xx_YY

closes #3969

mvidalgarcia/indico,ThiefMaster/indico,pferreir/indico,pferreir/indico,mic4ael/indico,OmeGak/indico,DirkHoffmann/indico,OmeGak/indico,mvidalgarcia/indico,mic4ael/indico,ThiefMaster/indico,pferreir/indico,indico/indico,DirkHoffmann/indico,ThiefMaster/indico,mic4ael/indico,mvidalgarcia/indico,indico/indico,mvidalgarcia/indico,DirkHoffmann/indico,ThiefMaster/indico,DirkHoffmann/indico,OmeGak/indico,mic4ael/indico,indico/indico,OmeGak/indico,indico/indico,pferreir/indico