Magento 2 Newsletter Popup : Newsletter Submit Button Label

Hi,

I would like to translate the Submit Button Label with the free version of Magento 2 Newsletter Popup. Everything is easy to translate except this button where there is a "Upgrade to Pro version to enable this functionality.".

I can't believe that we can translate everything except this button and this is not written in the free vs pro version comparison.

So do we really have to pay to translate the submit button or is this an error?

Thanks,