Easy Blog and Mailchimp integration

I am using EasyBlog with Mailchimp and the basic configuration is quite easy but I have an issue with the title in the emails. I created an override in the language in the EasyBlog Constants but MailChimp continues to send the message with the original language text.:

So every time I send a newsletter it reads:
There is a new blog post published on the site
New blog post posted

I would like to know how to change this as we want to update our email list to a total of +1500 clients we have.

Thanks