Add persistance information for each key under settings/security in pro mode

[let4be]

Currently it's totally unclear where we do persist keys and what's going on, regarding all the complexity we have in key persistance(private, non private pc, lavaboom sync and soon nonce-model to avoid storing plain/text decrypted keys)

So in pro mode I'd like to see where the key sits. Examples:

• Lavaboom sync(encrypted), session storage(decrypted)
• Lavaboom sync(encrypted), local storage(decrypted)

etc...