Support a secondary message in the single CTA email template.

services/web/app/coffee/Features/Email/Bodies/SingleCTAEmailBody.coffee

@@ -22,6 +22,12 @@ module.exports = _.template """
 				</a>
 			</td></tr></table></td></tr></table>
 		</center>
+		<% if (secondaryMessage) { %>
+			<table class="spacer" style="border-collapse: collapse; border-spacing: 0; padding: 0; text-align: left; vertical-align: top; width: 100%;"><tbody><tr style="padding: 0; text-align: left; vertical-align: top;"><td height="20px" style="-moz-hyphens: auto; -webkit-hyphens: auto; Margin: 0; border-collapse: collapse !important; color: #0a0a0a; font-family: Helvetica, Arial, sans-serif; font-size: 20px; font-weight: normal; hyphens: auto; line-height: 20px; margin: 0; mso-line-height-rule: exactly; padding: 0; text-align: left; vertical-align: top; word-wrap: break-word;">&#xA0;</td></tr></tbody></table> 
+			<p class="avoid-auto-linking" style="Margin: 0; color: #0a0a0a; font-family: Helvetica, Arial, sans-serif; font-size: 16px; font-weight: normal; line-height: 1.3; margin: 0; padding: 0; text-align: left;">
+				<%= secondaryMessage %>
+			</p>
+		<% } %>
 	</th>
 	<th class="expander" style="Margin: 0; color: #0a0a0a; font-family: Helvetica, Arial, sans-serif; font-size: 16px; font-weight: normal; line-height: 1.3; margin: 0; padding: 0 !important; text-align: left; visibility: hidden; width: 0;"></th></tr></table></th>
 </tr></tbody></table>