These are dates that admin/update-copyright did not update, or
updated incorrectly. Also, back out the copyright-date change to
doc/misc/texinfo.tex, as upstream hasn't updated that date yet.
* tutorials/TUTORIAL, tutorials/TUTORIAL.cs, tutorials/TUTORIAL.eo:
* tutorials/TUTORIAL.es, tutorials/TUTORIAL.it, tutorials/TUTORIAL.ja:
* tutorials/TUTORIAL.ko, tutorials/TUTORIAL.nl, tutorials/TUTORIAL.pl:
* tutorials/TUTORIAL.pt_BR, tutorials/TUTORIAL.ro:
* tutorials/TUTORIAL.ru, tutorials/TUTORIAL.sk, tutorials/TUTORIAL.sv:
* tutorials/TUTORIAL.th:
Avoid using ` for natural-language quotes. Instead, work around
the problem with "\" by using non-" quotation marks appropriate
for the natural language in question, e.g., «...» for Spanish.
For English “...” could be used, but use '...' instead so that
TUTORIAL continues to be encoded in ASCII.
