On euwiki when a user adds an email address in Special:Preferences, the email confirmation is sent. The email's subject header is displayed as following:
Subject: Ongi etorria [[:Txantiloi:SITEMANE]]ra: mesedez, ziurtatu zure e-posta helbidea
(compare, for example, with a subject header from cswiki)
Vítejte na Wikipedie: Prosím, potvrďte svou e-mailovou adresu