If you mean some static texts, they are all available in the Loco plugin translation editor. If you mean email tokens please select an email event when you add a new email, once you save changes a list of tokens will appear in the Details box.
You can change the “from” email using third-party plugins, e.g. YaySMTP (it’s also recommended to make your website emails trusted).
An email address that is considered to be from a valid user rather than spam or malware. Addresses marked as trusted senders go into the inbox rather than the spam folder.