You have to translate it and write the Castellan text yourself. The language in the Character properies is only responsible for spell checking and hyphenation. If your text is English your Pargraph style should be set up as English US, if your language is Castellan you have to set it up as Spanish.
Thank you. I was hoping there was a quick fix without me translating and writing everything again.
InDesign is not a translation application, and to be honest, automatic translations are horrible. Even here with Adobe with human translators we have often funny results in German in the program commands.
Machine translation, while it is available from some sources, should never be relied upon for anything other than gaining a rough understanding of a foreign-to-you text means.
If you have ever use the Translate button on the forum to read posts that are in languages other than your own, you will see that grammar and sentence structure can get mangled, and sometimes the result is not even understandable.
It takes a person reading and understanding the original text to properly rephrase it in the new language. It's not just converting words.