Keep it to what an email needs
This text goes out on every mail, so it is the wrong place for anything that changes. A group name, a one-line description and perhaps the group's address is the shape that ages well.
Every email the platform sends on your group's behalf ends with a signature. This tab is where that signature is written, once per language.
Email in the group settings is a short form: one field per active language, holding the text that goes at the bottom of every mail sent to your members. The greeting itself - "Cheers," or "Viele Grüße," - is not here; it belongs to the individual email template and changes with the language automatically.