Show authenticator name for WebAuthn

### Describe the problem

https://github.com/Stormbase/django-otp-webauthn/pull/149 introduced `identify` module to `django-otp-webauthn` which allows to show a human-readable name of the WebAuthn token. Let's use it.

### Solution brainstorm

Show it when user hasn't provided own name for the token.

### Describe alternatives you have considered

_No response_

### Screenshots

_No response_

### Additional context

_No response_

Start by locating WebAuthn token enrollment and display handling in the Weblate codebase, then inspect how django-otp-webauthn's identify module exposes a human-readable authenticator name. Preserve a user's custom token name, and use the authenticator name only when no custom name was provided; verify the affected authentication or settings tests.

Written by the indexing model from the issue text.