/usr/share/phpbb3/www/language/en_us/email/report_deleted.txt is in phpbb3-l10n 3.0.10-4+deb7u3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | Subject: Report deleted - "{POST_SUBJECT}"
Hello {USERNAME},
You are receiving this notification because the report you filed on the post "{POST_SUBJECT}" in "{TOPIC_TITLE}" at "{SITENAME}" was deleted by a moderator or by an administrator.
{EMAIL_SIG}
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