[meta] Manual account wishlist

This is a meta-bug. If you want to work on one of the bullet items, please open a new issue and we can reference it from here.

• Hide login/password from the new account form when the account is manual
• Find a way to translate "Manual account" in the user's current language
• Do not propose to add alerts by default for manual account in the new form
• A manual account should always be "disabled" (so it doesn't get the "sync" button nor the "resync balance" buttons in the settings).