[fix] ES: Do not try to parse tags on settings, invitation, message, etc.

[fix] ES: do not try to save sttings remotelly if not auth (no box keypair)
[enh] ES: compute box keypair once, on auth
[enh] Login: better message when bad pubkey
[enh] display loadingmessage when already login but need to load full data
[fix] Group: allow to delete a existing group