[FIX] Export ICal fails for some categories
[FIX] Export ICal fails for some categories

	- Encoding for the chair's info wasn't checked when exporting a conference to iCal
	- fix #255

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