fix encoding fail in calendar app - bugfix for oc-1194
fix encoding fail in calendar app - bugfix for oc-1194

jbicha/server,pixelipo/server,jbicha/server,sharidas/core,michaelletzgus/nextcloud-server,sharidas/core,andreas-p/nextcloud-server,bluelml/core,IljaN/core,lrytz/core,andreas-p/nextcloud-server,owncloud/core,Ardinis/server,endsguy/server,pmattern/server,sharidas/core,bluelml/core,cernbox/core,bluelml/core,andreas-p/nextcloud-server,cernbox/core,pmattern/server,IljaN/core,xx621998xx/server,owncloud/core,pollopolea/core,pollopolea/core,jbicha/server,pmattern/server,nextcloud/server,pollopolea/core,sharidas/core,IljaN/core,lrytz/core,andreas-p/nextcloud-server,whitekiba/server,nextcloud/server,endsguy/server,endsguy/server,IljaN/core,pixelipo/server,lrytz/core,whitekiba/server,cernbox/core,michaelletzgus/nextcloud-server,Ardinis/server,cernbox/core,michaelletzgus/nextcloud-server,pixelipo/server,nextcloud/server,xx621998xx/server,whitekiba/server,endsguy/server,pmattern/server,sharidas/core,whitekiba/server,endsguy/server,pixelipo/server,cernbox/core,whitekiba/server,andreas-p/nextcloud-server,Ardinis/server,IljaN/core,owncloud/core,michaelletzgus/nextcloud-server,jbicha/server,xx621998xx/server,bluelml/core,xx621998xx/server,Ardinis/server,lrytz/core,pmattern/server,owncloud/core,jbicha/server,phil-davis/core,pixelipo/server,Ardinis/server,xx621998xx/server,bluelml/core,lrytz/core,owncloud/core,nextcloud/server,pollopolea/core,pollopolea/core