Merge "Delete persistent volume" and "Configure persistent volume"
Type of work:
We should have a single menu entry called "Persistence":
- When there is no Persistence, it would create one.
- When there is Persistence and it's unlocked, it should open the configuration.
- When there is Persistence and it's locked, it should display something like this:
Tails was started with Persistence disabled. Restart Tails and unlock Persistence to use its content. [Delete Persistence] [Restart Tails]
With after that a scrary confirmation warning with a red button and everything:
Deleting Persistence will delete all your data: * Persistent folder * GnuPG keys * Thunderbird emails * etc. This operation cannot be undone. [Cancel] [Delete Persistence And Loose All My Data]