zxcvbn: Apply ROT13 when building the dynamic user_inputs dictionary.

The modified matcher assumes that the dictionaries are ROT13 encoded.
All of the static dictionaries were, but user_inputs wasn't. See #21737.

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Respect the `fields` arg when passed to `get_children()`.

Fixes #22208.


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Support `id=>name` and `id=>slug` values for `fields` arg in `get_terms()`. Adds unit tests.

Props mikeschinkel.

Fixes #13661.


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