Merge branch 'feature/tor-0.2.5.x-alpha' into feature/7909-scramblesuit

scramblesuit support requires Tor 0.2.5.
Document electrum's persistence preset.
Add design section about electrum.
Simplify sentence
Shorten introduction

Now that we don't include TrueCrypt and that it is not developed anymore we
don't need to justify why anymore.
Format alternative as tip
Move fact to the top
Rename TrueCrypt as 'Opening TrueCrypt volumes using cryptsetup'

We don't ship TrueCrypt anymore and this was the only section left on this page.
Fix formatting

You need to format full HTML inside <div>
Rephrase

- Use 'you' instead of 'one'
- Reuse the title of the page we link to
- Add DocBook classes
- Indicate on which version TrueCrypt was removed
Fix typo in CSS class name.
Update upgrade-description files.
Make it clear that we're fixing POODLE here.
Make it clear that one must reboot between l10n tests.

The torbrowser localization hacks (#8036, iirc) require this.
Adjust manual test a bit.
Test--: this bug was fixed.
Add 1.1.2 -> 1.2 full/incremental upgrade path on alpha channel to ease Tails 1.2 testing.
releasing version 1.2
updated PO files
updated PO files