Fix availability messages for lecture occurrences
Fix availability messages for lecture occurrences

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