I’m glad you find our plugin useful.
Regarding the email, that is not something of this plugin, it is a WordPress functionality. If you want to change that address, in order not to have deliverability problems in the emails you send, I recommend that you attach an SMTP account to your site using some kind of plugin for it.
As for the translation, you just have to translate the string using a plugin to translate strings like Loco Translate for example.