Missing comma in PASSWORD_EXPLAIN acp language strings

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).