Rethink the terminology around "temporary" Tails

Originally created by @sajolida on #10614 (Redmine)

  • Rephrase “temporary” Tails as “intermediary” Tails [11]
  • Popover to explain temporary Tails [11]

Feature Branch: web/10614-temporary-terminology

Parent Task: #8590 (closed)

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Edited by sajolida
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