Unsafe Browser still does not start (at least in pt-locale)

a user reported that bug, I reproduced it :

lauch Tails in portuguese, try to lauch the unsafe browser, it never start.

here are the logs :

unzip: cannot find or open /var/lib/unsafe-browser/chroot//usr/local/share/tor-browser-extensions/langpack-pt@firefox.mozilla.org.xpi, /var/lib/unsafe-browser/chroot//usr/local/share/tor-browser-extensions/langpack-pt@firefox.mozilla.org.xpi.zip or /var/lib/unsafe-browser/chroot//usr/local/share/tor-browser-extensions/langpack-pt@firefox.mozilla.org.xpi.ZIP.
sed: não foi possível ler /tmp/tmp.kIV4zhkPGG/browser/chrome/pt/locale/branding/brand.dtd: No such file or directory

so it really looks like https://labs.riseup.net/code/issues/8158 and https://labs.riseup.net/code/issues/8152, maybe the patch correcting it lost something on its way

Feature Branch: bugfix/8693-fix-tor-browser-locale-guessing

Original created by @goupille on 8693 (Redmine)