Lyra email subscription

Hi there,

I am editing some of the language in the Lyra theme to make my sign-up process custom to my general cadence with regards to user experience:

As such I would like to edit the language and reduce the emotes on the email which is sent to subscribers. However I cannot find the files within the file set lyra-master which I have been editing to customize my website.

Is it possible that I am overlooking the files which I require to be editing or is it that the files are not located within the theme itself?