Getting ready for 5.2

[jwag956]

• documentation improvements
• re-generate translations (no actual changes)
• update minimum package versions for setup 'extras'

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 :tada:

Comparison is base (0ba3f2d) 97.52% compared to head (84cf1d6) 97.55%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #793 +/- ## ========================================== + Coverage 97.52% 97.55% +0.02% ========================================== Files 34 34 Lines 4453 4450 -3 ========================================== - Hits 4343 4341 -2 + Misses 110 109 -1 ``` | [Impacted Files](https://app.codecov.io/gh/Flask-Middleware/flask-security/pull/793?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Flask-Middleware) | Coverage Δ | | |---|---|---| | [flask\_security/\_\_init\_\_.py](https://app.codecov.io/gh/Flask-Middleware/flask-security/pull/793?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Flask-Middleware#diff-Zmxhc2tfc2VjdXJpdHkvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [flask\_security/core.py](https://app.codecov.io/gh/Flask-Middleware/flask-security/pull/793?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Flask-Middleware#diff-Zmxhc2tfc2VjdXJpdHkvY29yZS5weQ==) | `98.60% <100.00%> (-0.01%)` | :arrow_down: | | [flask\_security/decorators.py](https://app.codecov.io/gh/Flask-Middleware/flask-security/pull/793?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Flask-Middleware#diff-Zmxhc2tfc2VjdXJpdHkvZGVjb3JhdG9ycy5weQ==) | `96.13% <100.00%> (+0.39%)` | :arrow_up: |

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