Hello,
First, someone needs to add 3.0.7 to the release version dropdown list for the bug tracker.
OK, so in language/en/acp/board.php for LDAP_PASSWORD_EXPLAIN, SMTP_PASSWORD_EXPLAIN, and JAB_PASSWORD_EXPLAIN is this:
<em><strong>Warning:</strong> This password will be stored as plain text in the database visible to everybody who can access your database or who can view this configuration page.</em>
Between database and visible should a comma. I've attached a patch file (I hope I did it right, it's my first one).