/usr/share/phpbb3/www/language/en_us/email/admin_activate.txt is in phpbb3-l10n 3.0.10-4+deb7u3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | Subject: Activate user account
Hello,
The account owned by "{USERNAME}" has been deactivated or newly created, you should check the details of this user (if required) and handle it appropriately.
Use this link to view the user's profile:
{U_USER_DETAILS}
Use this link to activate the account:
{U_ACTIVATE}
{EMAIL_SIG}
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