[tldoc] tl message updates

[Denis Bitouzé]

Le 17/03/19 à 16h56, Karl Berry a écrit :

> I trivially changed one of the original messages, to use the word
> "Copyright" instead of the copyright symbol in tlshell.tcl.

BTW, the corresponding string is:

  ┌────
  │ Copyright 2017, 2018 Siep Kroonenberg\n
  │ \n
  │ GUI interface for TeX Live Manager\n
  │ Implemented in Tcl/Tk\n
  └────

Shouldn't the years be "2017-2019"?
-- 
Denis