Adapt to Tor's Sponsor4 Tor Launcher UX improvements

Originally created by @anonym on #15064 (Redmine)

I.e.: https://trac.torproject.org/projects/tor/query?component=Applications%2FTor+Launcher&sponsor=Sponsor4

Feature Branch: feature/15197-tor-browser-7.5

Related issues

Blocks #13245 (closed)
Copied to #15331

Edited May 15, 2020 by anonym

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