The email templates contain references to .xsl files. The .xsl files contain the body text that is used by the templates. You need to configure the .xsl files.
Different types of text appear in the files:
Placeholder text, which is enclosed in square brackets, such as [organization name]
Plain text for the message
Parameters for personalization which start with
<xsl:value-of select=...>
You need to replace placeholder text with your organization name and contact information. You can also edit the plain text and add or remove parameters.