Add-forge-now: Change word-wrapping of email template to 72 columns

It looks weird when email clients soft-wrap on smaller number
of columns; eg. Thunderbird defaults to 72 when editing in
plain text.

assets/src/bundles/add_forge/forge-admin-email.ejs

@@ -6,21 +6,22 @@
 %>
 Dear forge administrator,
 
-The mission of Software Heritage is to collect, preserve and share all the
-publicly available source code (see https://www.softwareheritage.org for more
-information).
+The mission of Software Heritage is to collect, preserve and share all
+the publicly available source code (see
+https://www.softwareheritage.org for more information).
 
-We just received a request to add the forge hosted at <%= forgeUrl %> to the
-list of software origins that are archived, and it is our understanding that you
-are the contact person for this forge.
+We just received a request to add the forge hosted at <%= forgeUrl %>
+to the list of software origins that are archived, and it is our
+understanding that you are the contact person for this forge.
 
-In order to archive the forge contents, we will have to periodically pull the
-public repositories it contains and clone them into the
+In order to archive the forge contents, we will have to periodically
+pull the public repositories it contains and clone them into the
 Software Heritage archive.
 
-Would you be so kind as to reply to this message to acknowledge the reception
-of this email and let us know if there are any special steps we should take in
-order to properly archive the public repositories hosted on your infrastructure?
+Would you be so kind as to reply to this message to acknowledge the
+reception of this email and let us know if there are any special steps
+we should take in order to properly archive the public repositories
+hosted on your infrastructure?
 
 Thank you in advance for your help.