Hey Alejojo,
Thanks for contacting us! The Events Calendar and its add-ons adapt to use the same language used by your WordPress installation. It will default to English, unless you run WP in a different language. On your Dashboard, go to Settings → General. Scroll down to the bottom of the page where it says Site Language. Select your language from the dropdown and save your changes.
If necessary, you can find further information about how to change the language of your calendar here.
Let me know if you need anything else in the meantime and I’ll be happy to assist!
Regards,
Patricia