[tbb-bugs] #21847 [Applications/Tor Browser]: Update copy for security slider to be consistent with the mobile experience

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#21847: Update copy for security slider to be consistent with the mobile experience
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 Reporter:  isabela                              |          Owner:  tbb-
                                                 |  team
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-usability, tbb-security-slider,  |  Actual Points:
  TorBrowserTeam201712R, GeorgKoppen201712       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by mcs):

 The followup patch looks good to me.
 I did notice a small issue today when I ran with the new code on macOS:
 when the Security Settings window first opens, nthe "Learn More" link has
 the keyboard focus. I suppose that is just default XUL behavior (set focus
 to the first element that can have a keyboard focus), but it looks a
 little strange because macOS draws a box around the link. If you think
 this is worth fixing, the following addition to
 `torbutton_init_security_ui()` fixes it:
 {{{
   let okBtn = document.documentElement.getButton("accept");
   if (okBtn)
     okBtn.focus();
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21847#comment:16>
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