/usr/share/phpbb3/www/language/en_us/email/profile_send_im.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 9 10 11 12 | Hello {TO_USERNAME},
The following is a message sent to you by {FROM_USERNAME} via your account on "{SITENAME}". If this message is spam, contains abusive or other comments you find offensive please contact the webmaster of the board at the following address:
{BOARD_CONTACT}
Include this full message. Please note that the sender address has been set to the boards IM account.
Message sent to you follows
~~~~~~~~~~~~~~~~~~~~~~~~~~~
{MESSAGE}
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