fix allowed image types setting
fix allowed image types setting

derFreitag/mockup,domruf/mockup,domruf/mockup,domruf/mockup,derFreitag/mockup,termitnjak/mockup,derFreitag/mockup,termitnjak/mockup,derFreitag/mockup,plone/mockup,plone/mockup,plone/mockup,domruf/mockup,termitnjak/mockup,termitnjak/mockup