Setting Thunderbird email client attribution line format

[Arthur Marsh <arthur.marsh@internode.on.net>]

Hi, I must be missing something obvious, but I can't find how to set 
attribution lines in Thunderbird. I'd like to be able to have the 
following appear when I reply to a message:

On <name of day> <year>-<month>-<day>, <name email-address> wrote:

Where is this set and where is this setting documented?

Regards,

Arthur.