Date showing in english in a Brazilian website

Hello, Beloveds

1) My event displays in Brazilian Portuguese in Fb, but when the event appears in my site, it appears showing the date in english. Can i change this?

2) The thumbnail of the event in my site is so little. Can i augment it?

The embed facebook shortcode is on this page:
http://arun.com.br/?page_id=507

Thanks a lot!!

https://wordpress.org/plugins/wp-embed-facebook/