We can't know if the email had ever been set before.
And it doesn't matter.
<https://translatewiki.net/wiki/Thread:Translating_talk:MediaWiki/About_MediaWiki:Confirmemail_body_set/en>
Change-Id: I88ae448ac6a4742ae42dd354ff784c2506105313
'confirmemail_body_set' => 'Someone, probably you, from IP address $1,
has set the email address of the account "$2" to this address on {{SITENAME}}.
-To confirm that this account really does belong to you and reactivate
+To confirm that this account really does belong to you and activate
email features on {{SITENAME}}, open this link in your browser:
$3