Merge remote-tracking branch 'origin/feature/16388-tor-browser-8.0.5+force-all-tests' into testing (Fix-committed: #16388)

This reverts all changes to faq.*.po in commit 392b14e2.

Fix-committed: #16376

Merge remote-tracking branch 'origin/lamby/bugfix/16386-force-basebox-regeneration' into testing (Fix-committed: #16386)

Bump the APT snapshot serial in the vagrant builder for "debian{,-security}" and "debian" for Tails itself to ensure we pick up apt 1.4.9 for CVE-2019-3462. (refs: #16386)

Will-fix: #163883

This commit reintroduces changes that were lost in the conflict
resolution of merge 770bfdf2, reported by xin as:
* faq.es.po, faq.fr.po and faq.it.po in f7d26a70
* download.inline.de.po and download.inline.it.po in 4c33052e

Will-fix: #16376