v2 Tebex integration has been released, with a similar layout. You can find it here: https://namelessmc.com/resources/resource/54-tebex-integration/
In Nameless version 1, you can edit the files styles/language/language/language.php, search for $email_language in that file.
In Nameless version 2, have a look in custom/languages/language/user.php for most email text.
Try utf8mb4 for the database instead of latin1_swedish_ci; utf8mb4 has emoji support.
I'm afraid I'm not sure what's going on, do you have a link to the topic which has the problem?
Currently, if you use v2 you can use the Websend resource, and once the next v2 pre-release is out it will be possible to do this using the Nameless v2 plugin.