MB 75: Use Mullvad branding

Pier Angelo Vendramerequested to merge
pierov/mullvad-browser:75-use-mullvad-name into privacy-browser-102.8.0esr-12.0-1

Pair of changes to stop using 'Privacy Browser' and just start using 'Privacy Browser'.

Needed for tor-browser-build-s131!3 (merged).

Related to #75 (closed)

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