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/usr/share/po-debconf/templates/call-po is in po-debconf 1.0.20.

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The actual contents of the file can be viewed below.

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# Lines beginning with a number sign are comments, they are removed when
# sending mails.  If a line is composed of a # followed by a 'Name: Value'
# pair, it is interpreted as a mail header field and is passed to your mail
# transport agent.  You can edit/add/remove those header fields.
# 
# From: <from>
# Subject: <package_and_version>: Please translate the package <package>
# Reply-To: <reply-to>

Dear Debian I18N people,

I would like to know if some of you would be interested in translating
<package>.

<package> already includes <filelist>.
So do not translate it to these languages (the translators will be
contacted separately).

<statistics>

<reply>
<deadline>

If you have read so far, please find the POT file in attachment.

Thanks in advance,