Hi TenerifeIT,
the Custom Layout defaults that allows you to create a different layout for JEvents views is available in the JEvents core component for free. Have you checked the layout is published after editing it? Can you please check your modifications have been correctly stored in the editor?
I think this video will make you easier to see how this custom layout works:
http://www.jevents.net/docs/jevents/ite ... ory_id=129
Regarding different layouts for each language. Right now it's not possible unless you create a template overrides for the views you want to edit and detect the language and shows your specific layout. In any case at this moment that cannot be done using the layout editor, although is a planned feature to have different layouts for different categories (which will suit your needs as language selection in JEvents is at category level).