Offer to create Password when one is required

[steve-1507]

The user should be offered to create a password when they are about to do an action requiring one, e.g. SFTP. Maybe there can be a new field "Password" in the "Show connection details" popup that shows either <Your account password> or a button that creates a password. That way there won't be any confusion with less experienced users who may not know that they use their account pw.