A GRUB password is almost always useless. Ruben (Trisquel's leader) has
realized it: Trisquel 8 does not have such a password by default anymore. Of
course GRUB can still be configured to set such a password.
Without encryption, you can use any live system to access the data and to
even get a terminal on the installed system (through 'chroot') to set the
password of any user (without knowing the previous one).
On the contrary, a password to encrypt an home folder cannot be changed
without knowing or discovering (e.g., by social engineering or by brute force
if the password is weak) the current one. If that would be the case,
encryption would be as useless as a GRUB password. By default, the password
to decrypt your home folder is the user password but changing that password
will not change the password of the encryption.
Apparently, you actually have no data to recover anyway: just reinstall.
About the "fr" in the URL, it defined the preferred language for the site
(https://trisquel.info/forum/lost-password or
https://trisquel.info/en/forum/lost-password direct to the same thread) and
has nothing to do with the French-speaking sub-forum, which is
https://trisquel.info/forum/trisquel-utilisateurs
