Choosing default language of a form

If I have a form that supports english and spanish, is there a way to default to either language when the form is loaded.  ie. in some cases I want the form to load as spanish and other times english

Yes, it's possible to do that, first you need to follow this guide in order to add the language to the form: https://www.jotform.com/help/298-How-to-Make-Your-Forms-Multilingual 

Then you need to edit the settings so the form changes automatically based on the browser language: 

I hope this helps.