To avoid misleading users about private key usage, change:
  example.onion is requesting your private key.
to:
  example.onion is requesting that you authenticate.

We also show a tooltip with the full domain on hover, so that it's not
necessary to copy it for users to see it.

Add strings for onion service error pages.

Replace "Keep Tor strong"
with    "Tor is free to use because of donations from people like you"

Add strings for "Remember this key" checkbox and the new
"Onion Services Authentication" preferences section.

The link is now constructed in code (instead of coming from aboutTor.dtd)
and it is:
  https://community.torproject.org/LOCALE
where LOCALE is the current browser locale.