Escape sequence scheme:
  lowercase -> random value
  uppercase -> default or current value
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#:  (at the beginning of a string) signals do not perform translation
%B: the bot's nick
%n: random nick from channel
%N: nick of person addressing bot
%i: random integer
%d: random date
%D: today's date
%w: word from list of random words
%H: the current host (ie, the one on which the bot runs)
