Fix validation for enterprise in ns.backup

[stephdl]

This pull request fixes a validation issue in the ns.backup file for the enterprise feature.

This pull request fixes also the usage of passphrase with the stored backup, previously it was None

now in case of restore we handle three errors

• wrong backup type
• encrypted archive but missing passphrase : error.backup_passphrase_passphrase_required
• encrypted archive but wrong passphrase

translation must be added

https://github.com/NethServer/nethsecurity/issues/587

[stephdl]

I hope you are wrong, the wrong passphrase is raised by the 85, the missing passphrase when required (means encrypted) is sent back by line 79

however actually you are right, the translation restore failed returns a problem of backup file or missing passphrase

[gsanchietti]

however actually you are right, the translation restore failed returns a problem of backup file or missing passphrase

so we need to fix it

[gsanchietti]

I have cherry-picked the good commit: https://github.com/NethServer/nethsecurity/commit/44bc3f2c5d1b9ea8a89e758b48a35b5a709eafc6

[stephdl]

obsoleted by https://github.com/NethServer/nethsecurity/pull/598