Translations: zh locale folder names might not correct

**Describe your question**
1. The folder name of these two locale codes, `zh-Hans` and `zh-Hant`, should be `locale/zh_Hans` and `locale/zh_Hant`, not `locale/zh-Hans` or `locale/zh-Hant`. They are both named `zh_Hans` and `zh_Hant` in [django](https://github.com/django/django/tree/main/django/conf/locale/zh_Hans) and [django-reset-framework](https://github.com/encode/django-rest-framework/tree/master/rest_framework/locale/zh_Hant)
2. Why don't we add the `django.middleware.locale.LocaleMiddleware` to `MIDDLEWARE` in `root/settings.py`. The `Log in` button of `Identification Stage` will never be translated if we don't enable it

**Relevant info**
"Log in" string is the primary_action [here](https://github.com/goauthentik/authentik/blob/main/authentik/stages/identification/stage.py#L211)

**Screeshots**
The "Email or Username" has been translated to "电子邮箱或用户名", but the "Log in" doesn't be translated to "登录"

**Version and Deployment (please complete the following information):**
- authentik version: [e.g. 2024.10.0]
- Deployment: [e.g. docker-compose, helm]

The issue points to the locale/zh-Hans and locale/zh-Hant folders, root/settings.py, and authentik/stages/identification/stage.py:211. Start by checking the locale folder naming and middleware configuration, then verify that the Identification Stage's "Log in" string is translated to Chinese and that the relevant locale tests pass.

Written by the indexing model from the issue text.