GitLab

- Improve phrasing
- Remove CSS classes

Now all this section is about the Welcome Screen only.

Currently translated at 17.7% (11 of 62 strings)

Translation: Tails/wiki/src/news/version_3.14.1.*.po
Translate-URL: http://translate.tails.boum.org/projects/tails/wikisrcnewsversion_3141po/pt/

Currently translated at 39.0% (16 of 41 strings)

Translation: Tails/wiki/src/news/version_3.11.*.po
Translate-URL: http://translate.tails.boum.org/projects/tails/wikisrcnewsversion_311po/it/

Hopefully, Weblate will suggest the same translations (once we have it).

We used this terminology as a shortcut when we were supporting both USB
sticks and SD cards but now it's almost always superfluous, so let's
talk explicitly about USB stick as much as possible.

Will-fix: #11128

  - Two of them pointed to the "stay tuned" section. Now that we have
    incremental upgrades, and the subscription form to amnesia-news on the
    homepage of the browser, it's ok not to put that much emphasis on this.

Firmware can also be provided by the OS, as in

    dpkg -l | grep -i firmware